I'm not sure if you see comments on closed issues so I'm opening this as a new issue.

Issue #1427 still exists in build 228. I've reproduced it using @natedogith1's setup. If you turn on the lever in this setup then the bedrock will disappear.

Blocks get destroyed if they are in the mana generating zone and the game-of-life rules want to place a cell with generation >= 2 in that location.

Yes we can see comments on closed issues.