
Hi! It is a known bug affecting Edge version 138.0.3351.83 and some recent builds.
Current Status (as of July 2025)
Microsoft has acknowledged the error in the recent builds for the Insider, as well as stable ones. This seems to be related to caching and saving tab group metadata at close, with Workspaces seeming to behave even more inconsistently.
This s likely to be fixed in an upcoming Edge Stable update (possibly 139.x) but , no timeframe when it will be released.
Regards,
Iggy