There was a bug in updater-migrate script causing to be error reported even when there was no error as updater wasn’t instructed to close state log. In reality I forgot to add single switch to single shell script. That’s it.
In previous Turris OS release (3.7.2) there were more fixes, but once again those were just some forgotten lines and such that would cause problems during update to planned Turris OS 3.8.
There was nothing that would be major. Even this post is longer than those changes are. If you are interested in changes in updater you can found more information in tag messages in git as writing them to changelog would be mostly excessive.