Fixing every bug as you go is not efficient. The disappearing tombstone bug strikes rarely and is easily remedied by keeping backups. If the solution on the code side is not that obvious, the best thing for the devs to do is ignore it, for now, and keep working on features.

I have run into this bug once. I tried multiple times to replicate it, getting killed and esc-quitting as fast as I could. No joy. This thing is going to be hard to fix, and they should not fix it until the polishing phase.

In all software it is normal that some bugs take a long time to fix.