diff --git a/tests/PHPStan/Rules/Methods/CallMethodsRuleTest.php b/tests/PHPStan/Rules/Methods/CallMethodsRuleTest.php
index 9eaa82d4cb..e0dd1ad3fa 100644
--- a/tests/PHPStan/Rules/Methods/CallMethodsRuleTest.php
+++ b/tests/PHPStan/Rules/Methods/CallMethodsRuleTest.php
@@ -2384,4 +2384,22 @@ public function testBug6118(): void
 		$this->analyse([__DIR__ . '/data/bug-6118.php'], []);
 	}
 
+	public function testBug6464(): void
+	{
+		$this->checkThisOnly = false;
+		$this->checkNullables = true;
+		$this->checkUnionTypes = true;
+		$this->checkExplicitMixed = true;
+		$this->analyse([__DIR__ . '/data/bug-6464.php'], []);
+	}
+
+	public function testBug6423(): void
+	{
+		$this->checkThisOnly = false;
+		$this->checkNullables = true;
+		$this->checkUnionTypes = true;
+		$this->checkExplicitMixed = true;
+		$this->analyse([__DIR__ . '/data/bug-6423.php'], []);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/Methods/ReturnTypeRuleTest.php b/tests/PHPStan/Rules/Methods/ReturnTypeRuleTest.php
index a637934679..dd17e454e9 100644
--- a/tests/PHPStan/Rules/Methods/ReturnTypeRuleTest.php
+++ b/tests/PHPStan/Rules/Methods/ReturnTypeRuleTest.php
@@ -603,4 +603,22 @@ public function testBug6589(): void
 		]);
 	}
 
+	public function testBug6418(): void
+	{
+		$this->checkExplicitMixed = true;
+		$this->analyse([__DIR__ . '/data/bug-6418.php'], []);
+	}
+
+	public function testBug6230(): void
+	{
+		$this->checkExplicitMixed = true;
+		$this->analyse([__DIR__ . '/data/bug-6230.php'], []);
+	}
+
+	public function testBug5860(): void
+	{
+		$this->checkExplicitMixed = true;
+		$this->analyse([__DIR__ . '/data/bug-5860.php'], []);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/Methods/data/bug-5860.php b/tests/PHPStan/Rules/Methods/data/bug-5860.php
new file mode 100644
index 0000000000..f41cab6c93
--- /dev/null
+++ b/tests/PHPStan/Rules/Methods/data/bug-5860.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Bug5860;
+
+class Foo
+{
+
+	/**
+	 * @template T
+	 * @param T $t
+	 * @return T
+	 */
+	function test($t) {
+		if ($t === null) {
+			return $t;
+		}
+		return $t;
+	}
+
+}
diff --git a/tests/PHPStan/Rules/Methods/data/bug-6230.php b/tests/PHPStan/Rules/Methods/data/bug-6230.php
new file mode 100644
index 0000000000..64e24a052f
--- /dev/null
+++ b/tests/PHPStan/Rules/Methods/data/bug-6230.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Bug6230;
+
+class Foo
+{
+
+	/**
+	 * @param ?iterable<mixed> $it
+	 * @return ?iterable<mixed>
+	 */
+	function test($it): ?iterable
+	{
+		return $it;
+	}
+
+}
+
+/**
+ * @template T
+ */
+class Example
+{
+	/**
+	 * @var ?iterable<T>
+	 */
+	private $input;
+
+
+	/**
+	 * @param iterable<T> $input
+	 */
+	public function __construct(iterable $input)
+	{
+		$this->input = $input;
+	}
+
+	/** @return ?iterable<T> */
+	public function get(): ?iterable
+	{
+		return $this->input;
+	}
+}
diff --git a/tests/PHPStan/Rules/Methods/data/bug-6418.php b/tests/PHPStan/Rules/Methods/data/bug-6418.php
new file mode 100644
index 0000000000..d1fb02a4fe
--- /dev/null
+++ b/tests/PHPStan/Rules/Methods/data/bug-6418.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Bug6418;
+
+class Foo
+{
+
+	/**
+	 * @template T
+	 *
+	 * @param T&\DateTimeInterface $p
+
+	 * @return T
+	 */
+	function test($p) {
+		return $p;
+	}
+
+}
diff --git a/tests/PHPStan/Rules/Methods/data/bug-6423.php b/tests/PHPStan/Rules/Methods/data/bug-6423.php
new file mode 100644
index 0000000000..8d8a4205ab
--- /dev/null
+++ b/tests/PHPStan/Rules/Methods/data/bug-6423.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Bug6423;
+
+class Foo
+{
+
+
+	/**
+	 * @param null|list<mixed> $foos
+	 */
+	function doFoo(?array $foos = null): void {}
+
+	/**
+	 * @return list<string>
+	 */
+	function doBar(): array
+	{
+		return [
+			'hello',
+			'world',
+		];
+	}
+
+	function doBaz()
+	{
+		$this->doFoo([
+			'foo',
+			'bar',
+			...$this->doBar(),
+		]);
+	}
+
+}
diff --git a/tests/PHPStan/Rules/Methods/data/bug-6464.php b/tests/PHPStan/Rules/Methods/data/bug-6464.php
new file mode 100644
index 0000000000..0cc01b2790
--- /dev/null
+++ b/tests/PHPStan/Rules/Methods/data/bug-6464.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Bug6464;
+
+interface Foo
+{
+	/** @param \Generator<int, mixed, mixed, void> $g */
+	public function foo(\Generator $g): void;
+}
+
+class Bar
+{
+
+	function test(Foo $foo): void {
+		$foo->foo((function(string $str)  {
+			yield $str;
+		})('hello'));
+	}
+
+}