[Bug] Collabora after restart only read-only in documents

## Describe the bug
Sometimes it happens that for a user if they collaborate the sheet is froozen. It seems that the file is then locked for that user. Is there a way to not have that as it can lead to frustration (only a reload helps).

<img width="1633" height="321" alt="Image" src="https://github.com/user-attachments/assets/8d01f514-dc31-40a1-8038-956d0bcd44b2" />
