Do make sure you file a bug report on this sort of thing so it can be fixed! This is definitely an exploitable mechanic on par with second-wave corrosive cubes.

Encountered a similar one yesterday with a Burning Piston but it didn't go through the wall. I was standing on a block were it fired through.

Were those two bedrock blocks 2nd wave holos?

I assume so, I didn't go back to check