Some bugs reported in Discord have been fixed in UModeler 2.6.12 which is available. Check out below to know what have been fixed.

Version 2.6.12
Hotfix : Select All Tool - Fix bug where vertex overlays aren’t updated when selecting all vertices using Select All Tool.
Hotfix : Line Tool - Fix bug where a line couldn’t cut a polygon when the umodeler object is too large.
Here is the release note.