It is a beta. If you really care about things not getting deleted, messed up, lost, etc. due to bugs, you shouldn't be using a beta.
It doesn't help fix what's happening and I can imagine it's frustrating. Take it as a lesson, simply don't use betas if you're not prepared to encounter precisely these kinds of scenarios - as it can and does happen with pre-release software.
I understand the risks, I do care and now I want it fixed.