Copied Reports and Version Control Issues

I have a base template, which I copy in order to create specific reports. However, I’ve found that this week, all my reports have had one chart “Reverted” to a much older version which was removed.
Is this intended behaviour? have I inadvertently overwritten my charts?

I’m quite confused as to what is happening here

That’s weird! To my knowledge, copied charts shouldn’t have any connection to each other.

Are you able to see the history and restore it? https://support.google.com/looker-studio/answer/9265174