- How could have been the pressure plate still activated if I did not drop the skull?
- Why did it deactivate once I returned skull into inventory but was standing several squares away from the pressure plate - I believe this is a bug to be fixed
Both these points look like a bug we haven't seen yet. We will try to reproduce it.
- Am I now trapped and have to restart a game?
You should still be able to throw some item on the platform through the bars.
BTW when the skull was "in hand" I tried tapping the ground but nothing happened. Maybe I missed.
There was a bug in launch version of the game that made it difficult tu manipulate with items on the same square you were standing on. It has been fixed in the first update (1.0.31019032), so I recommend you to download it. If you already have it (please, let us know with some details) or you see it in the PC version (not yet updated), you can do it from any neighbor square without leaning down, so the bug doesn't trigger. We apologize for the inconvenience.