diff --git a/src/Parser/NewAssignedToPropertyVisitor.php b/src/Parser/NewAssignedToPropertyVisitor.php
index 60fd8fd72e..7808d82fce 100644
--- a/src/Parser/NewAssignedToPropertyVisitor.php
+++ b/src/Parser/NewAssignedToPropertyVisitor.php
@@ -16,7 +16,7 @@ final class NewAssignedToPropertyVisitor extends NodeVisitorAbstract
 	#[Override]
 	public function enterNode(Node $node): ?Node
 	{
-		if ($node instanceof Node\Expr\Assign || $node instanceof Node\Expr\AssignRef) {
+		if ($node instanceof Node\Expr\Assign || $node instanceof Node\Expr\AssignRef || $node instanceof Node\Expr\AssignOp) {
 			if (
 				($node->var instanceof Node\Expr\PropertyFetch || $node->var instanceof Node\Expr\StaticPropertyFetch)
 				&& $node->expr instanceof Node\Expr\New_
diff --git a/src/Rules/PhpDoc/InvalidPHPStanDocTagRule.php b/src/Rules/PhpDoc/InvalidPHPStanDocTagRule.php
index 2a75a6c8c6..d0d20f4ba9 100644
--- a/src/Rules/PhpDoc/InvalidPHPStanDocTagRule.php
+++ b/src/Rules/PhpDoc/InvalidPHPStanDocTagRule.php
@@ -88,7 +88,11 @@ public function processNode(Node $node, Scope $scope): array
 			return [];
 		}
 		if ($node instanceof Node\Stmt\Expression) {
-			if (!$node->expr instanceof Node\Expr\Assign && !$node->expr instanceof Node\Expr\AssignRef) {
+			if (
+				!$node->expr instanceof Node\Expr\Assign
+				&& !$node->expr instanceof Node\Expr\AssignRef
+				&& !$node->expr instanceof Node\Expr\AssignOp
+			) {
 				return [];
 			}
 		}
diff --git a/src/Rules/PhpDoc/InvalidPhpDocTagValueRule.php b/src/Rules/PhpDoc/InvalidPhpDocTagValueRule.php
index 4b18ca789a..edf59cd62f 100644
--- a/src/Rules/PhpDoc/InvalidPhpDocTagValueRule.php
+++ b/src/Rules/PhpDoc/InvalidPhpDocTagValueRule.php
@@ -47,7 +47,11 @@ public function processNode(Node $node, Scope $scope): array
 			return [];
 		}
 		if ($node instanceof Node\Stmt\Expression) {
-			if (!$node->expr instanceof Node\Expr\Assign && !$node->expr instanceof Node\Expr\AssignRef) {
+			if (
+				!$node->expr instanceof Node\Expr\Assign
+				&& !$node->expr instanceof Node\Expr\AssignRef
+				&& !$node->expr instanceof Node\Expr\AssignOp
+			) {
 				return [];
 			}
 		}
diff --git a/src/Rules/PhpDoc/WrongVariableNameInVarTagRule.php b/src/Rules/PhpDoc/WrongVariableNameInVarTagRule.php
index 4c78688ff1..6296e12ca6 100644
--- a/src/Rules/PhpDoc/WrongVariableNameInVarTagRule.php
+++ b/src/Rules/PhpDoc/WrongVariableNameInVarTagRule.php
@@ -288,7 +288,11 @@ private function processForeach(Scope $scope, Node\Expr $iterateeExpr, ?Node\Exp
 	 */
 	private function processExpression(Scope $scope, Expr $expr, array $varTags): array
 	{
-		if ($expr instanceof Node\Expr\Assign || $expr instanceof Node\Expr\AssignRef) {
+		if (
+			$expr instanceof Node\Expr\Assign
+			|| $expr instanceof Node\Expr\AssignRef
+			|| $expr instanceof Node\Expr\AssignOp
+		) {
 			return $this->processAssign($scope, $expr->var, $expr->expr, $varTags);
 		}
 
diff --git a/tests/PHPStan/Rules/PhpDoc/InvalidPHPStanDocTagRuleTest.php b/tests/PHPStan/Rules/PhpDoc/InvalidPHPStanDocTagRuleTest.php
index ba9b73ad41..e6005045ac 100644
--- a/tests/PHPStan/Rules/PhpDoc/InvalidPHPStanDocTagRuleTest.php
+++ b/tests/PHPStan/Rules/PhpDoc/InvalidPHPStanDocTagRuleTest.php
@@ -54,6 +54,16 @@ public function testBug8697(): void
 		$this->analyse([__DIR__ . '/data/bug-8697.php'], []);
 	}
 
+	public function testAssignOperator(): void
+	{
+		$this->analyse([__DIR__ . '/data/invalid-phpstan-doc-assign-operator.php'], [
+			[
+				'Unknown PHPDoc tag: @phpstan-va',
+				9,
+			],
+		]);
+	}
+
 	#[RequiresPhp('>= 8.4')]
 	public function testPropertyHooks(): void
 	{
diff --git a/tests/PHPStan/Rules/PhpDoc/InvalidPhpDocTagValueRuleTest.php b/tests/PHPStan/Rules/PhpDoc/InvalidPhpDocTagValueRuleTest.php
index dcb6f03bbf..0fbe4ced57 100644
--- a/tests/PHPStan/Rules/PhpDoc/InvalidPhpDocTagValueRuleTest.php
+++ b/tests/PHPStan/Rules/PhpDoc/InvalidPhpDocTagValueRuleTest.php
@@ -126,6 +126,16 @@ public function testIgnoreWithinPhpDoc(): void
 		$this->analyse([__DIR__ . '/data/ignore-line-within-phpdoc.php'], []);
 	}
 
+	public function testAssignOperator(): void
+	{
+		$this->analyse([__DIR__ . '/data/invalid-phpdoc-assign-operator.php'], [
+			[
+				'PHPDoc tag @var has invalid value (\\\\Foo|\Bar $test): Unexpected token "\\\\\\\\Foo|\\\\Bar", expected type at offset 9 on line 1',
+				8,
+			],
+		]);
+	}
+
 	public function testBug6299(): void
 	{
 		$this->analyse([__DIR__ . '/data/bug-6299.php'], [
diff --git a/tests/PHPStan/Rules/PhpDoc/WrongVariableNameInVarTagRuleTest.php b/tests/PHPStan/Rules/PhpDoc/WrongVariableNameInVarTagRuleTest.php
index b0d9948e37..838211838e 100644
--- a/tests/PHPStan/Rules/PhpDoc/WrongVariableNameInVarTagRuleTest.php
+++ b/tests/PHPStan/Rules/PhpDoc/WrongVariableNameInVarTagRuleTest.php
@@ -548,6 +548,28 @@ public function testReportWrongType(
 		$this->analyse([__DIR__ . '/data/wrong-var-native-type.php'], $expectedErrors);
 	}
 
+	public function testAssignOperator(): void
+	{
+		$this->analyse([__DIR__ . '/data/wrong-variable-name-var-assign-op.php'], [
+			[
+				'PHPDoc tag @var with type int is not subtype of native type void.',
+				11,
+			],
+			[
+				'PHPDoc tag @var with type int is not subtype of native type void.',
+				14,
+			],
+			[
+				'PHPDoc tag @var with type int is not subtype of native type void.',
+				20,
+			],
+			[
+				'PHPDoc tag @var with type int is not subtype of native type void.',
+				23,
+			],
+		]);
+	}
+
 	public function testBug12457(): void
 	{
 		$this->checkTypeAgainstPhpDocType = true;
diff --git a/tests/PHPStan/Rules/PhpDoc/data/invalid-phpdoc-assign-operator.php b/tests/PHPStan/Rules/PhpDoc/data/invalid-phpdoc-assign-operator.php
new file mode 100644
index 0000000000..c45c91135a
--- /dev/null
+++ b/tests/PHPStan/Rules/PhpDoc/data/invalid-phpdoc-assign-operator.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace InvalidPhpDocAssignOperator;
+
+function foo()
+{
+
+	/** @var \\Foo|\Bar $test */
+	$test ??= doFoo();
+
+}
diff --git a/tests/PHPStan/Rules/PhpDoc/data/invalid-phpstan-doc-assign-operator.php b/tests/PHPStan/Rules/PhpDoc/data/invalid-phpstan-doc-assign-operator.php
new file mode 100644
index 0000000000..f11c134e93
--- /dev/null
+++ b/tests/PHPStan/Rules/PhpDoc/data/invalid-phpstan-doc-assign-operator.php
@@ -0,0 +1,12 @@
+<?php
+
+namespace InvalidPHPStanDocAssignOperator;
+
+class Boo extends Baz
+{
+	function baz()
+	{
+		/** @phpstan-va */
+		$c ??= 'foo';
+	}
+}
diff --git a/tests/PHPStan/Rules/PhpDoc/data/wrong-variable-name-var-assign-op.php b/tests/PHPStan/Rules/PhpDoc/data/wrong-variable-name-var-assign-op.php
new file mode 100644
index 0000000000..bff43e053a
--- /dev/null
+++ b/tests/PHPStan/Rules/PhpDoc/data/wrong-variable-name-var-assign-op.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace WrongVariableNameVarTagAssignOperator;
+
+class Foo
+{
+
+	public function doFoo()
+	{
+		/** @var int $test */
+		$test ??= doFoo();
+
+		/** @var int */
+		$test ??= doFoo();
+	}
+
+	public function doBar(string $string)
+	{
+		/** @var int $string */
+		$string .= doFoo();
+
+		/** @var int */
+		$string .= doFoo();
+	}
+
+}
+
+function doFoo(): void
+{
+
+}
diff --git a/tests/PHPStan/Rules/Properties/TypesAssignedToPropertiesRuleTest.php b/tests/PHPStan/Rules/Properties/TypesAssignedToPropertiesRuleTest.php
index 5f3578f946..cf7136dd1f 100644
--- a/tests/PHPStan/Rules/Properties/TypesAssignedToPropertiesRuleTest.php
+++ b/tests/PHPStan/Rules/Properties/TypesAssignedToPropertiesRuleTest.php
@@ -1019,4 +1019,15 @@ public function testCloneWith(): void
 		]);
 	}
 
+	#[RequiresPhp('>= 8.0')]
+	public function testBug12250(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-12250.php'], []);
+	}
+
+	public function testBug4525(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-4525.php'], []);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/Properties/data/bug-12250.php b/tests/PHPStan/Rules/Properties/data/bug-12250.php
new file mode 100644
index 0000000000..4c0ebea53e
--- /dev/null
+++ b/tests/PHPStan/Rules/Properties/data/bug-12250.php
@@ -0,0 +1,17 @@
+<?php // lint >= 8.0
+
+namespace Bug12250;
+
+class HelloWorld
+{
+	/**
+	 * @var \WeakMap<\stdClass, \stdClass>
+	 */
+	protected \WeakMap $bug, $ok;
+
+	public function bug(): void
+	{
+		$this->bug ??= new \WeakMap();
+		$this->ok = new \WeakMap();
+	}
+}
diff --git a/tests/PHPStan/Rules/Properties/data/bug-4525.php b/tests/PHPStan/Rules/Properties/data/bug-4525.php
new file mode 100644
index 0000000000..3441b25c88
--- /dev/null
+++ b/tests/PHPStan/Rules/Properties/data/bug-4525.php
@@ -0,0 +1,24 @@
+<?php // lint >= 7.4
+
+namespace Bug4525;
+
+use SplObjectStorage;
+
+class HelloWorld
+{
+	/**
+	 * @var SplObjectStorage<\DateTime, \DateTimeImmutable>
+	 */
+	private SplObjectStorage $map;
+
+	public function sayHello(): void
+	{
+		$this->map = new SplObjectStorage();
+	}
+
+	/** @phpstan-return SplObjectStorage<\DateTime, \DateTimeImmutable> */
+	public function getMap(): SplObjectStorage
+	{
+		return $this->map ??= new SplObjectStorage();
+	}
+}