Factorio Forums

Replication:

1. Start Rocket Rush
2. Destruction tool the concrete ground
3. Undo

Basically since you start with bots and the tile is destroyable, I believe the space aspect caused a scenario where ground can be permanently removed very trivially, without being able to replace it simply by undoing.

Thanks for the report. All tiles in the rocket rush lobby will be non deconstructible in 2.0.6.