Meteroids pass through tiles of generated structures

I think the real issue here is that the tiles aren't visually being destroyed even though they are, switch to the light overlay and you'll see light passing trough the blocks

Those tiles are somewhere in between.

Meteors also leave a message "Meteor damage" when they pass though these tiles but without stopping even the smallest meteors. And dupes cannot move over these destroyed tiles but they can deconstruct them.