diff --git a/src/DependencyInjection/LazyContainerFactory.php b/src/DependencyInjection/LazyContainerFactory.php
index 9ee6280ca2a..748f31e1f19 100644
--- a/src/DependencyInjection/LazyContainerFactory.php
+++ b/src/DependencyInjection/LazyContainerFactory.php
@@ -148,7 +148,6 @@
 use Rector\PHPStanStaticTypeMapper\TypeMapper\ConditionalTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\ConstantArrayTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\FloatTypeMapper;
-use Rector\PHPStanStaticTypeMapper\TypeMapper\GenericClassStringTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\HasMethodTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\HasOffsetTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\HasOffsetValueTypeTypeMapper;
@@ -165,11 +164,9 @@
 use Rector\PHPStanStaticTypeMapper\TypeMapper\OversizedArrayTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\ParentStaticTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\ResourceTypeMapper;
-use Rector\PHPStanStaticTypeMapper\TypeMapper\SelfObjectTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\StaticTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\StrictMixedTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\StringTypeMapper;
-use Rector\PHPStanStaticTypeMapper\TypeMapper\ThisTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\TypeWithClassNameTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\UnionTypeMapper;
 use Rector\PHPStanStaticTypeMapper\TypeMapper\VoidTypeMapper;
@@ -303,7 +300,6 @@ final class LazyContainerFactory
         ConditionalTypeForParameterMapper::class,
         ConditionalTypeMapper::class,
         FloatTypeMapper::class,
-        GenericClassStringTypeMapper::class,
         HasMethodTypeMapper::class,
         HasOffsetTypeMapper::class,
         HasOffsetValueTypeTypeMapper::class,
@@ -320,11 +316,9 @@ final class LazyContainerFactory
         OversizedArrayTypeMapper::class,
         ParentStaticTypeMapper::class,
         ResourceTypeMapper::class,
-        SelfObjectTypeMapper::class,
         StaticTypeMapper::class,
         StrictMixedTypeMapper::class,
         StringTypeMapper::class,
-        ThisTypeMapper::class,
         TypeWithClassNameTypeMapper::class,
         UnionTypeMapper::class,
         VoidTypeMapper::class,
diff --git a/src/PHPStanStaticTypeMapper/TypeMapper/GenericClassStringTypeMapper.php b/src/PHPStanStaticTypeMapper/TypeMapper/GenericClassStringTypeMapper.php
deleted file mode 100644
index b85df380011..00000000000
--- a/src/PHPStanStaticTypeMapper/TypeMapper/GenericClassStringTypeMapper.php
+++ /dev/null
@@ -1,50 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Rector\PHPStanStaticTypeMapper\TypeMapper;
-
-use PhpParser\Node;
-use PhpParser\Node\Identifier;
-use PHPStan\PhpDocParser\Ast\Type\TypeNode;
-use PHPStan\Type\Generic\GenericClassStringType;
-use PHPStan\Type\Type;
-use Rector\Php\PhpVersionProvider;
-use Rector\PHPStanStaticTypeMapper\Contract\TypeMapperInterface;
-use Rector\ValueObject\PhpVersionFeature;
-
-/**
- * @implements TypeMapperInterface<GenericClassStringType>
- */
-final readonly class GenericClassStringTypeMapper implements TypeMapperInterface
-{
-    public function __construct(
-        private PhpVersionProvider $phpVersionProvider
-    ) {
-    }
-
-    public function getNodeClass(): string
-    {
-        return GenericClassStringType::class;
-    }
-
-    /**
-     * @param GenericClassStringType $type
-     */
-    public function mapToPHPStanPhpDocTypeNode(Type $type): TypeNode
-    {
-        return $type->toPhpDocNode();
-    }
-
-    /**
-     * @param GenericClassStringType $type
-     */
-    public function mapToPhpParserNode(Type $type, string $typeKind): ?Node
-    {
-        if (! $this->phpVersionProvider->isAtLeastPhpVersion(PhpVersionFeature::SCALAR_TYPES)) {
-            return null;
-        }
-
-        return new Identifier('string');
-    }
-}
diff --git a/src/PHPStanStaticTypeMapper/TypeMapper/SelfObjectTypeMapper.php b/src/PHPStanStaticTypeMapper/TypeMapper/SelfObjectTypeMapper.php
deleted file mode 100644
index 738cd579b59..00000000000
--- a/src/PHPStanStaticTypeMapper/TypeMapper/SelfObjectTypeMapper.php
+++ /dev/null
@@ -1,38 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Rector\PHPStanStaticTypeMapper\TypeMapper;
-
-use PhpParser\Node\Name;
-use PHPStan\PhpDocParser\Ast\Type\TypeNode;
-use PHPStan\Type\Type;
-use Rector\PHPStanStaticTypeMapper\Contract\TypeMapperInterface;
-use Rector\StaticTypeMapper\ValueObject\Type\SelfObjectType;
-
-/**
- * @implements TypeMapperInterface<SelfObjectType>
- */
-final class SelfObjectTypeMapper implements TypeMapperInterface
-{
-    public function getNodeClass(): string
-    {
-        return SelfObjectType::class;
-    }
-
-    /**
-     * @param SelfObjectType $type
-     */
-    public function mapToPHPStanPhpDocTypeNode(Type $type): TypeNode
-    {
-        return $type->toPhpDocNode();
-    }
-
-    /**
-     * @param SelfObjectType $type
-     */
-    public function mapToPhpParserNode(Type $type, string $typeKind): Name
-    {
-        return new Name('self');
-    }
-}
diff --git a/src/PHPStanStaticTypeMapper/TypeMapper/ThisTypeMapper.php b/src/PHPStanStaticTypeMapper/TypeMapper/ThisTypeMapper.php
deleted file mode 100644
index fb2a26b3938..00000000000
--- a/src/PHPStanStaticTypeMapper/TypeMapper/ThisTypeMapper.php
+++ /dev/null
@@ -1,38 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Rector\PHPStanStaticTypeMapper\TypeMapper;
-
-use PhpParser\Node\Name;
-use PHPStan\PhpDocParser\Ast\Type\TypeNode;
-use PHPStan\Type\ThisType;
-use PHPStan\Type\Type;
-use Rector\PHPStanStaticTypeMapper\Contract\TypeMapperInterface;
-
-/**
- * @implements TypeMapperInterface<ThisType>
- */
-final class ThisTypeMapper implements TypeMapperInterface
-{
-    public function getNodeClass(): string
-    {
-        return ThisType::class;
-    }
-
-    /**
-     * @param ThisType $type
-     */
-    public function mapToPHPStanPhpDocTypeNode(Type $type): TypeNode
-    {
-        return $type->toPhpDocNode();
-    }
-
-    /**
-     * @param ThisType $type
-     */
-    public function mapToPhpParserNode(Type $type, string $typeKind): Name
-    {
-        return new Name('self');
-    }
-}
diff --git a/tests/PHPStanStaticTypeMapper/TypeMapperOrderTest.php b/tests/PHPStanStaticTypeMapper/TypeMapperOrderTest.php
new file mode 100644
index 00000000000..0b2b779aa0f
--- /dev/null
+++ b/tests/PHPStanStaticTypeMapper/TypeMapperOrderTest.php
@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Tests\PHPStanStaticTypeMapper;
+
+use Rector\PHPStanStaticTypeMapper\Contract\TypeMapperInterface;
+use Rector\Testing\PHPUnit\AbstractLazyTestCase;
+
+final class TypeMapperOrderTest extends AbstractLazyTestCase
+{
+    /**
+     * The mappers are matched with is_a() in registration order, so a mapper for a child type
+     * must come before the mapper for its parent type. Otherwise the parent one always wins
+     * and the child one is never reached.
+     */
+    public function testChildTypeMapperIsRegisteredBeforeItsParent(): void
+    {
+        $typeMappers = $this->resolveTypeMappers();
+
+        foreach ($typeMappers as $position => $typeMapper) {
+            $nodeClass = $typeMapper->getNodeClass();
+
+            for ($earlierPosition = 0; $earlierPosition < $position; ++$earlierPosition) {
+                $earlierNodeClass = $typeMappers[$earlierPosition]->getNodeClass();
+
+                $this->assertFalse(is_a($nodeClass, $earlierNodeClass, true), sprintf(
+                    'The "%s" is registered after "%s", but "%s" is a "%s". It can never be reached, register it earlier.',
+                    $typeMapper::class,
+                    $typeMappers[$earlierPosition]::class,
+                    $nodeClass,
+                    $earlierNodeClass
+                ));
+            }
+        }
+    }
+
+    /**
+     * @return TypeMapperInterface[]
+     */
+    private function resolveTypeMappers(): array
+    {
+        $typeMappers = iterator_to_array(self::getContainer()->tagged(TypeMapperInterface::class));
+
+        $this->assertNotEmpty($typeMappers);
+
+        return array_values($typeMappers);
+    }
+}