diff --git a/src/Type/Php/ArraySearchFunctionDynamicReturnTypeExtension.php b/src/Type/Php/ArraySearchFunctionDynamicReturnTypeExtension.php
index 7190cb4d392..4a8dbd56de6 100644
--- a/src/Type/Php/ArraySearchFunctionDynamicReturnTypeExtension.php
+++ b/src/Type/Php/ArraySearchFunctionDynamicReturnTypeExtension.php
@@ -11,7 +11,6 @@
 use PHPStan\Type\ConstantScalarType;
 use PHPStan\Type\DynamicFunctionReturnTypeExtension;
 use PHPStan\Type\NullType;
-use PHPStan\Type\ObjectWithoutClassType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
 use PHPStan\Type\TypeUtils;
@@ -93,33 +92,25 @@ public function getTypeFromFunctionCall(FunctionReflection $functionReflection,
 	private function resolveTypeFromConstantHaystackAndNeedle(Type $needle, ConstantArrayType $haystack): Type
 	{
 		$matchesByType = [];
+		$hasIdenticalValue = false;
 
 		foreach ($haystack->getValueTypes() as $index => $valueType) {
 			$isNeedleSuperType = $valueType->isSuperTypeOf($needle);
 			if ($isNeedleSuperType->no()) {
-				$matchesByType[] = new ConstantBooleanType(false);
 				continue;
 			}
 
 			if ($needle instanceof ConstantScalarType && $valueType instanceof ConstantScalarType
 				&& $needle->getValue() === $valueType->getValue()
 			) {
-				return $haystack->getKeyTypes()[$index];
+				$hasIdenticalValue = true;
 			}
 
 			$matchesByType[] = $haystack->getKeyTypes()[$index];
-			if (!$isNeedleSuperType->maybe()) {
-				continue;
-			}
-
-			$matchesByType[] = new ConstantBooleanType(false);
 		}
 
 		if (count($matchesByType) > 0) {
-			if (
-				$haystack->getIterableValueType()->accepts($needle, true)->yes()
-				&& $needle->isSuperTypeOf(new ObjectWithoutClassType())->no()
-			) {
+			if ($hasIdenticalValue) {
 				return TypeCombinator::union(...$matchesByType);
 			}
 
diff --git a/tests/PHPStan/Analyser/NodeScopeResolverTest.php b/tests/PHPStan/Analyser/NodeScopeResolverTest.php
index b4ebdfdf5ad..b70e71c2f73 100644
--- a/tests/PHPStan/Analyser/NodeScopeResolverTest.php
+++ b/tests/PHPStan/Analyser/NodeScopeResolverTest.php
@@ -1054,6 +1054,7 @@ public function dataFileAsserts(): iterable
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/array-offset-unset.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-8008.php');
 		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-5552.php');
+		yield from $this->gatherAssertTypes(__DIR__ . '/data/bug-3789.php');
 	}
 
 	/**
diff --git a/tests/PHPStan/Analyser/data/bug-3789.php b/tests/PHPStan/Analyser/data/bug-3789.php
new file mode 100644
index 00000000000..c5d89f2a5df
--- /dev/null
+++ b/tests/PHPStan/Analyser/data/bug-3789.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Bug3789;
+
+use function PHPStan\Testing\assertType;
+
+/**
+ * @param array{string, string, string} $haystack
+ */
+function doFoo(string $needle, array $haystack): void {
+	assertType('0|1|2|false', array_search($needle, $haystack, true));
+	assertType('0|1|2|false', array_search('foo', $haystack, true));
+
+	$haystack[1] = 'foo';
+	assertType('0|1|2|false', array_search($needle, $haystack, true));
+	assertType('0|1|2', array_search('foo', $haystack, true));
+}