bug #3191 Fix 2.x -> 3.x merge (Kocal)

This PR was merged into the 3.x branch.

Discussion
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 Fix 2.x -> 3.x merge

| Q              | A
| -------------- | ---
| Bug fix?       | yes
| New feature?   | no <!-- please update src/**/CHANGELOG.md files -->
| Deprecations?  | no <!-- if yes, also update UPGRADE-*.md and src/**/CHANGELOG.md -->
| Documentation? | no <!-- required for new features, or documentation updates -->
| Issues         | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->
| License        | MIT

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Commits
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20277fc Fix 2.x -> 3.x merge

Author: Kocal

src/TwigComponent/src/ComponentTemplateFinder.php

@@ -34,7 +34,7 @@ public function findAnonymousComponentTemplate(string $name): ?string
         }
 
         $template = rtrim($this->directory, '/').'/'.$componentPath.'/index.html.twig';
-        if ($loader->exists($template)) {
+        if ($this->loader->exists($template)) {
             return $template;
         }