The map Slaughter Courtyard (KOTH) has no OP blocks and it basically gets destroyed, and the KOTH area turns into a hole.
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Thank you for informing us of these flaws but in future you can report map issues here - http://blocktopia.net/forum/threads/map-report-thread.11634/In 2Fort, you cannot get out of the rooms with the Stone Pressure Pads, you step on them but it doesn't let you open the doors.
This happens on both sides.
EDIT: Another bug has popped up, in the bottom layers of the map, it is still destructible and you can blow up the floor to reveal the void, this happens in the sewers and the intel basements