Can’t get shrine on last floor because boss dungeon ends after final boss kill…
Don’t kill the boss on the last floor. Of you already entered into battle, pause and retreat from the fight. This will take you back to the shrine, entrance portal or exit portal (whichever you last touched). You can then continue to explore. Once you have done all you would like, then kill the boss.
The problem the OP is describing is that he can’t get to the shrine, as the tile with the boss fight on it is the only passage to that part of the floor.
The community can’t help you with this, so you’ll have to submit this as a bug report to CS in game if you haven’t already done so.
You need wall hack to get to that shrine lmao