Validation error from outdated files in sys/versions (regression?)

Hello,
Any updates on this issue?

I’m still investigating on my end to try unblock my project, and I found a new piece of information.
The last version of my island uploaded to the server was version 3880 (I found this in the project size window, the date and time match with the last session I was able to launch).
Screenshot 2025-06-05 at 13.05.18

However, when I start a new session, the version created in the sys folder is 3873.

I’m not entirely sure how the session cooking process works, but could this mismatch be causing the issue?