Chat disappeared after "not owned by the user" error

Description:
A chat that I created and was actively using has suddenly disappeared. The chat was several weeks old, used regularly, and I had pinned it to my chat list. The chat title contained “MPX Bearbeitung”. I am the owner of the chat, I did not delete it, and it was not shared with anyone else.

Error Message:
not owned by the user

Steps to Reproduce:

  1. Opened the existing and pinned chat titled “MPX Bearbeitung”.

  2. Wrote a message and attempted to insert an image into the chat.

  3. During the image insertion process, the error message “not owned by the user” was displayed.

  4. After refreshing the page/application, the entire chat was gone and is no longer visible in my chat list.

Expected Result:
The image should be successfully inserted into the chat, and the chat should remain visible and accessible as normal.

Actual Result:
After an error message and a page refresh, the chat has completely disappeared and is no longer accessible.

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