I updated Discourse and stumbled upon some notices:
[Admin-Hinweis] Theme ‘discourse-social-links-clickable’ enthält Code, der aktualisiert werden muss. (ID:discourse.native-array-extensions.filterBy)
And in developer console:
deprecated.js:54 [THEME 11 'discourse-social-links-clickable'] DEPRECATION NOTICE: The array.filterBy is a deprecated Ember native array extension. Use native array methods or a TrackedArray instead. [deprecated since Discourse 3.6.0.beta1-dev] [deprecation id: discourse.native-array-extensions.filterBy]