All clips deleted from timeline after crash in 15b4

I have repeated crashes with Resolve 15 B4 with stacked timelines and multiple timelines open in tabs when re-opening a project.
Clicking on one of the non-active tabs causes Resolve to crash sometimes after showing the pop-up "loading timeline".
After one of the crashes today, the active timeline came up empty, with all previously added and cut clips removed.
I now seem to have lost that one timeline completely, as Resolve shows the duration and frame count as 0 in the bin.

Unfortunately I don't have a backup, from all the changes I made yesterday and have to redo it again now.
I have submitted three crash reports in total with the new automatic crash report pop-up.

Yesterday everything worked fine, but today, again the same problem, with the added bonus that Resolve would immediately crash when loading the project.

I could only get it back by restoring the whole database from backup.
This is in Resolve Studio using PostgreSQL, by the way (crash report was also submitted again).

Marcus