diff --git a/ReSharper.FSharp/src/FSharp.Psi/src/Resolve/FSharpFileResolvedSymbols.cs b/ReSharper.FSharp/src/FSharp.Psi/src/Resolve/FSharpFileResolvedSymbols.cs
index a8daeb0939..566ebbe655 100644
--- a/ReSharper.FSharp/src/FSharp.Psi/src/Resolve/FSharpFileResolvedSymbols.cs
+++ b/ReSharper.FSharp/src/FSharp.Psi/src/Resolve/FSharpFileResolvedSymbols.cs
@@ -243,7 +243,7 @@ private ResolvedSymbols CreateFileResolvedSymbols()
 
     private static bool CanIgnoreSymbol([NotNull] FSharpSymbol symbol) =>
       symbol is FSharpEntity || 
-      symbol is FSharpMemberOrFunctionOrValue mfv && mfv.LogicalName == "op_RangeStep";
+      symbol is FSharpMemberOrFunctionOrValue mfv && (mfv.LogicalName == "op_RangeStep" || mfv.IsConstructor);
 
     private TextRange FixRange(int startOffset, int endOffset, [CanBeNull] string logicalName, IBuffer buffer,
       CachingLexer lexer)
@@ -268,7 +268,7 @@ private ResolvedSymbols CreateFileResolvedSymbols()
           return new TextRange(startOffset, endOffset);
 
         // todo: use lexer buffer
-        if (lexer.FindTokenAt(endOffset - 1) && lexer.TokenType is TokenNodeType tokenType)
+        if (lexer.FindTokenAt(endOffset - 1) && lexer.TokenType is { } tokenType)
         {
           var opText = tokenType == FSharpTokenType.SYMBOLIC_OP ? sourceName : logicalName;
           return new TextRange(endOffset - opText.Length, endOffset);
diff --git a/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 01.fs b/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 01.fs
new file mode 100644
index 0000000000..a7b1a96705
--- /dev/null
+++ b/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 01.fs	
@@ -0,0 +1,2 @@
+type T() =
+    static member M1(?a) = ()
diff --git a/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 01.fs.gold b/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 01.fs.gold
new file mode 100644
index 0000000000..3fcd16ce7e
--- /dev/null
+++ b/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 01.fs.gold	
@@ -0,0 +1,7 @@
+type |T|(0)() =
+    static member |M1|(1)(?|a|(2)) = ()
+
+---------------------------------------------------------
+(0): ReSharper F# Class Identifier: 
+(1): ReSharper F# Method Identifier: 
+(2): ReSharper F# Value Identifier: 
diff --git a/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 02 - Private.fs b/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 02 - Private.fs
new file mode 100644
index 0000000000..a042be25fc
--- /dev/null
+++ b/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 02 - Private.fs	
@@ -0,0 +1,2 @@
+type T() =
+    static member private M1(?a) = ()
diff --git a/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 02 - Private.fs.gold b/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 02 - Private.fs.gold
new file mode 100644
index 0000000000..7f7057e8a5
--- /dev/null
+++ b/ReSharper.FSharp/test/data/features/daemon/identifierHighlighting/Method - Parameters - Optional 02 - Private.fs.gold	
@@ -0,0 +1,7 @@
+type |T|(0)() =
+    static member private |M1|(1)(?|a|(2)) = ()
+
+---------------------------------------------------------
+(0): ReSharper F# Class Identifier: 
+(1): ReSharper F# Method Identifier: 
+(2): ReSharper F# Value Identifier: 
diff --git a/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters 03 - Optional.fs b/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 01.fs
similarity index 100%
rename from ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters 03 - Optional.fs
rename to ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 01.fs
diff --git a/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters 03 - Optional.fs.gold b/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 01.fs.gold
similarity index 100%
rename from ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters 03 - Optional.fs.gold
rename to ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 01.fs.gold
diff --git a/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters 04 - Optional.fs b/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 02.fs
similarity index 100%
rename from ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters 04 - Optional.fs
rename to ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 02.fs
diff --git a/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters 04 - Optional.fs.gold b/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 02.fs.gold
similarity index 100%
rename from ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters 04 - Optional.fs.gold
rename to ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 02.fs.gold
diff --git a/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 03 - Private.fs b/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 03 - Private.fs
new file mode 100644
index 0000000000..30429287dc
--- /dev/null
+++ b/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 03 - Private.fs	
@@ -0,0 +1,2 @@
+type T =
+    static member private M(?a) = ()
diff --git a/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 03 - Private.fs.gold b/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 03 - Private.fs.gold
new file mode 100644
index 0000000000..214598e429
--- /dev/null
+++ b/ReSharper.FSharp/test/data/parsing/Type member - Member - Method - Parameters - Optional 03 - Private.fs.gold	
@@ -0,0 +1,39 @@
+Language: PsiLanguageType:F#
+IFSharpImplFile
+  IAnonModuleDeclaration
+    ITypeDeclarationGroup
+      FSharpTokenType+TypeTokenElement(type:TYPE, text:type)
+      Whitespace(type:WHITE_SPACE, text: ) spaces:" "
+      IFSharpTypeDeclaration
+        FSharpIdentifierToken(type:IDENTIFIER, text:T)
+        Whitespace(type:WHITE_SPACE, text: ) spaces:" "
+        FSharpTokenType+EqualsTokenElement(type:EQUALS, text:=)
+        NewLine(type:NEW_LINE, text:\n) spaces:"\n"
+        Whitespace(type:WHITE_SPACE, text:    ) spaces:"    "
+        ITypeMemberDeclarationList
+          IMemberDeclaration
+            FSharpTokenType+StaticTokenElement(type:STATIC, text:static)
+            Whitespace(type:WHITE_SPACE, text: ) spaces:" "
+            FSharpTokenType+MemberTokenElement(type:MEMBER, text:member)
+            Whitespace(type:WHITE_SPACE, text: ) spaces:" "
+            FSharpTokenType+PrivateTokenElement(type:PRIVATE, text:private)
+            Whitespace(type:WHITE_SPACE, text: ) spaces:" "
+            FSharpIdentifierToken(type:IDENTIFIER, text:M)
+            IParametersPatternDeclaration
+              IParenPat
+                FSharpTokenType+LparenTokenElement(type:LPAREN, text:()
+                IOptionalValPat
+                  FSharpTokenType+QmarkTokenElement(type:QMARK, text:?)
+                  ILocalReferencePat
+                    IExpressionReferenceName
+                      FSharpIdentifierToken(type:IDENTIFIER, text:a)
+                FSharpTokenType+RparenTokenElement(type:RPAREN, text:))
+            Whitespace(type:WHITE_SPACE, text: ) spaces:" "
+            FSharpTokenType+EqualsTokenElement(type:EQUALS, text:=)
+            Whitespace(type:WHITE_SPACE, text: ) spaces:" "
+            IChameleonExpression
+              IUnitExpr
+                FSharpTokenType+LparenTokenElement(type:LPAREN, text:()
+                FSharpTokenType+RparenTokenElement(type:RPAREN, text:))
+    NewLine(type:NEW_LINE, text:\n) spaces:"\n"
+
diff --git a/ReSharper.FSharp/test/src/FSharp.Tests/Daemon/IdentifierHighlightingTest.fs b/ReSharper.FSharp/test/src/FSharp.Tests/Daemon/IdentifierHighlightingTest.fs
index 998692c199..f82097ddb4 100644
--- a/ReSharper.FSharp/test/src/FSharp.Tests/Daemon/IdentifierHighlightingTest.fs
+++ b/ReSharper.FSharp/test/src/FSharp.Tests/Daemon/IdentifierHighlightingTest.fs
@@ -57,3 +57,6 @@ type IdentifierHighlightingTest() =
     [<Test>] member x.``Type aliases 02 - Simple types without System dependence``() = x.DoNamedTest()
     [<Test>] member x.``Type aliases 03 - Units of Measure``() = x.DoNamedTest()
     [<Test>] member x.``Type aliases 04 - Core abbreviations``() = x.DoNamedTest()
+
+    [<Test>] member x.``Method - Parameters - Optional 01``() = x.DoNamedTest()
+    [<Test>] member x.``Method - Parameters - Optional 02 - Private``() = x.DoNamedTest()
diff --git a/ReSharper.FSharp/test/src/FSharp.Tests/Parsing/FSharpParserTest.fs b/ReSharper.FSharp/test/src/FSharp.Tests/Parsing/FSharpParserTest.fs
index eab37c3258..9cbd5a50e2 100644
--- a/ReSharper.FSharp/test/src/FSharp.Tests/Parsing/FSharpParserTest.fs
+++ b/ReSharper.FSharp/test/src/FSharp.Tests/Parsing/FSharpParserTest.fs
@@ -368,10 +368,11 @@ type FSharpParserTest() =
 
     [<Test>] member x.``Type member - Member 01 - Wild self id``() = x.DoNamedTest()
 
+    [<Test>] member x.``Type member - Member - Method - Parameters - Optional 01``() = x.DoNamedTest()
+    [<Test>] member x.``Type member - Member - Method - Parameters - Optional 02``() = x.DoNamedTest()
+    [<Test>] member x.``Type member - Member - Method - Parameters - Optional 03 - Private``() = x.DoNamedTest()
     [<Test>] member x.``Type member - Member - Method - Parameters 01``() = x.DoNamedTest()
     [<Test>] member x.``Type member - Member - Method - Parameters 02``() = x.DoNamedTest()
-    [<Test>] member x.``Type member - Member - Method - Parameters 03 - Optional``() = x.DoNamedTest()
-    [<Test>] member x.``Type member - Member - Method - Parameters 04 - Optional``() = x.DoNamedTest()
 
     [<Test>] member x.``Type member - Member - Method - Curried Parameters 01``() = x.DoNamedTest()