Towerd disappear later in the dtd example

[simpsus]

We are totally stuck on this one. I already ran some tests with omitted experience and score, but that didn't help.
The symptoms: The tower just disappears. The cell is still blocked, the rounding box is still drawn (if enabled), so the creeps still walk the maze as before. Only the tower is no longer drawn and the tower does not shoot anymore.

So far I have not been able to link it to a special event or type of tower.

This is also very hard to reproduce and debug as you have to play the game each time >lvl30 and the debug, even limited to the tower module is huge...