Trash feature of Nextcloud 13 (Deleted Files App)

Hello Community!

Is this a bug? Following problem:
The trash feature of Nextcloud is a very important and useful feature.
Since version 13 I have noticed after several Nextcloudinstallationen that deleted files do not end up in the trash (pdf, txt, etc.), but directly deleted (or are these only invisible?). If you delete folders containing the files, the folder including the files in the trash can be found again. Deleted empty folders can also be found again. As mentioned above, deleted files do not end up in the trash and it’s a mystery to me …

Does anyone have a tip for me? How to fix?

Kind regards

The app is active I suppose…

What about the quota? A user must have enough quota left that versioning and trashbin are used.