Changes to a Collaborative Document in ONLYOFFICE not saved or visible in version history

Workspace
1

We were editing a collaborative document with a table in ONLYOFFICE, and multiple users could see the changes in real-time. However, these changes were not saved and do not appear in the version history. What could be causing this issue?
ver. 9.0.3.1

2

Hello @Yuri

Do I understand that all users closed the document after editing?

3

It’s possible that not all users closed the document after editing. Could this be related to the issue?