Davinci Resolve 15 beta2 kills link to optimized media

so it randomly kills optimized media when doing something in timeline, like muving audio while still playing, that was the last time I've noticed that, and the previous was just reopening a project.
and the worst part they become unrediscoverable like back in dvr 12

And I had a live save turned on and it kills for sure the links.
Previously I could quit without saving to maintain the OM.

I repeated this test three times and all three randomly have lost the OM
So here is before and after logs.
https://adobe.ly/2wcMhiB
https://adobe.ly/2KAGd6M
also the project:
https://1drv.ms/u/s!AsHzv4ikTmhMi-YVkK_5VSSLZx_elw