diff --git a/src/Reflection/Annotations/AnnotationsMethodsClassReflectionExtension.php b/src/Reflection/Annotations/AnnotationsMethodsClassReflectionExtension.php
index efbf6423255..91fdbe77156 100644
--- a/src/Reflection/Annotations/AnnotationsMethodsClassReflectionExtension.php
+++ b/src/Reflection/Annotations/AnnotationsMethodsClassReflectionExtension.php
@@ -7,12 +7,14 @@
 use PHPStan\Reflection\ClassReflection;
 use PHPStan\Reflection\ExtendedMethodReflection;
 use PHPStan\Reflection\MethodsClassReflectionExtension;
+use PHPStan\ShouldNotHappenException;
 use PHPStan\Type\Generic\TemplateTypeFactory;
 use PHPStan\Type\Generic\TemplateTypeHelper;
 use PHPStan\Type\Generic\TemplateTypeMap;
 use PHPStan\Type\Generic\TemplateTypeScope;
 use PHPStan\Type\Generic\TemplateTypeVariance;
 use PHPStan\Type\Type;
+use function array_key_exists;
 use function array_map;
 use function count;
 
@@ -21,25 +23,36 @@
 final class AnnotationsMethodsClassReflectionExtension implements MethodsClassReflectionExtension
 {
 
-	/** @var ExtendedMethodReflection[][] */
+	/** @var array<string, array<string, ExtendedMethodReflection|null>> */
 	private array $methods = [];
 
 	public function hasMethod(ClassReflection $classReflection, string $methodName): bool
 	{
-		if (!isset($this->methods[$classReflection->getCacheKey()][$methodName])) {
-			$method = $this->findClassReflectionWithMethod($classReflection, $classReflection, $methodName);
-			if ($method === null) {
-				return false;
-			}
-			$this->methods[$classReflection->getCacheKey()][$methodName] = $method;
+		return $this->findMethod($classReflection, $methodName) !== null;
+	}
+
+	public function getMethod(ClassReflection $classReflection, string $methodName): ExtendedMethodReflection
+	{
+		$method = $this->findMethod($classReflection, $methodName);
+		if ($method === null) {
+			throw new ShouldNotHappenException();
 		}
 
-		return true;
+		return $method;
 	}
 
-	public function getMethod(ClassReflection $classReflection, string $methodName): ExtendedMethodReflection
+	/**
+	 * Remembers misses too: the lookup recurses into the parent and every
+	 * interface, which reach the same ancestors many times over.
+	 */
+	private function findMethod(ClassReflection $classReflection, string $methodName): ?ExtendedMethodReflection
 	{
-		return $this->methods[$classReflection->getCacheKey()][$methodName];
+		$cacheKey = $classReflection->getCacheKey();
+		if (!array_key_exists($methodName, $this->methods[$cacheKey] ?? [])) {
+			$this->methods[$cacheKey][$methodName] = $this->findClassReflectionWithMethod($classReflection, $classReflection, $methodName);
+		}
+
+		return $this->methods[$cacheKey][$methodName];
 	}
 
 	private function findClassReflectionWithMethod(
@@ -102,14 +115,14 @@ private function findClassReflectionWithMethod(
 
 		$parentClass = $classReflection->getParentClass();
 		if ($parentClass !== null) {
-			$methodWithDeclaringClass = $this->findClassReflectionWithMethod($parentClass, $parentClass, $methodName);
+			$methodWithDeclaringClass = $this->findMethod($parentClass, $methodName);
 			if ($methodWithDeclaringClass !== null) {
 				return $methodWithDeclaringClass;
 			}
 		}
 
 		foreach ($classReflection->getInterfaces() as $interfaceClass) {
-			$methodWithDeclaringClass = $this->findClassReflectionWithMethod($interfaceClass, $interfaceClass, $methodName);
+			$methodWithDeclaringClass = $this->findMethod($interfaceClass, $methodName);
 			if ($methodWithDeclaringClass === null) {
 				continue;
 			}
diff --git a/src/Reflection/Annotations/AnnotationsPropertiesClassReflectionExtension.php b/src/Reflection/Annotations/AnnotationsPropertiesClassReflectionExtension.php
index f51577a281d..5b9183bfff4 100644
--- a/src/Reflection/Annotations/AnnotationsPropertiesClassReflectionExtension.php
+++ b/src/Reflection/Annotations/AnnotationsPropertiesClassReflectionExtension.php
@@ -6,34 +6,47 @@
 use PHPStan\Reflection\ClassReflection;
 use PHPStan\Reflection\ExtendedPropertyReflection;
 use PHPStan\Reflection\PropertiesClassReflectionExtension;
+use PHPStan\ShouldNotHappenException;
 use PHPStan\Type\Generic\TemplateTypeHelper;
 use PHPStan\Type\Generic\TemplateTypeVariance;
 use PHPStan\Type\NeverType;
+use function array_key_exists;
 
 // autoTag: false - wired explicitly in ClassReflectionExtensionRegistry, must not be tagged
 #[AutowiredService(autoTag: false)]
 final class AnnotationsPropertiesClassReflectionExtension implements PropertiesClassReflectionExtension
 {
 
-	/** @var ExtendedPropertyReflection[][] */
+	/** @var array<string, array<string, ExtendedPropertyReflection|null>> */
 	private array $properties = [];
 
 	public function hasProperty(ClassReflection $classReflection, string $propertyName): bool
 	{
-		if (!isset($this->properties[$classReflection->getCacheKey()][$propertyName])) {
-			$property = $this->findClassReflectionWithProperty($classReflection, $classReflection, $propertyName);
-			if ($property === null) {
-				return false;
-			}
-			$this->properties[$classReflection->getCacheKey()][$propertyName] = $property;
+		return $this->findProperty($classReflection, $propertyName) !== null;
+	}
+
+	public function getProperty(ClassReflection $classReflection, string $propertyName): ExtendedPropertyReflection
+	{
+		$property = $this->findProperty($classReflection, $propertyName);
+		if ($property === null) {
+			throw new ShouldNotHappenException();
 		}
 
-		return true;
+		return $property;
 	}
 
-	public function getProperty(ClassReflection $classReflection, string $propertyName): ExtendedPropertyReflection
+	/**
+	 * Remembers misses too: the lookup recurses into the parent and every
+	 * interface, which reach the same ancestors many times over.
+	 */
+	private function findProperty(ClassReflection $classReflection, string $propertyName): ?ExtendedPropertyReflection
 	{
-		return $this->properties[$classReflection->getCacheKey()][$propertyName];
+		$cacheKey = $classReflection->getCacheKey();
+		if (!array_key_exists($propertyName, $this->properties[$cacheKey] ?? [])) {
+			$this->properties[$cacheKey][$propertyName] = $this->findClassReflectionWithProperty($classReflection, $classReflection, $propertyName);
+		}
+
+		return $this->properties[$cacheKey][$propertyName];
 	}
 
 	private function findClassReflectionWithProperty(
@@ -87,14 +100,14 @@ private function findClassReflectionWithProperty(
 
 		$parentClass = $classReflection->getParentClass();
 		if ($parentClass !== null) {
-			$methodWithDeclaringClass = $this->findClassReflectionWithProperty($parentClass, $parentClass, $propertyName);
+			$methodWithDeclaringClass = $this->findProperty($parentClass, $propertyName);
 			if ($methodWithDeclaringClass !== null) {
 				return $methodWithDeclaringClass;
 			}
 		}
 
 		foreach ($classReflection->getInterfaces() as $interfaceClass) {
-			$methodWithDeclaringClass = $this->findClassReflectionWithProperty($interfaceClass, $interfaceClass, $propertyName);
+			$methodWithDeclaringClass = $this->findProperty($interfaceClass, $propertyName);
 			if ($methodWithDeclaringClass === null) {
 				continue;
 			}