In the crypt Keeper's puzzle room on level 6, I seem to have found a game stopper.
I finished the first part, and was working on the second. While figuring out the correct placement of symbolic stones, one was placed just behind, in a straight line, to the dial/pedestal in the closest right-hand dial. This would also be around the 5 o'clock position if standing in the center facing the gated opening. (See attachment)
There seems to be a spot just behind or on the pedestal's edge where the game will freeze if you drop a symbolic stone there, evidenced by the object shadow. Once I released the symbolic and let it drop, the game froze.
This was reproduced multiple times on my end, resulting in the game freezing. It took an Alt-Tab and guess-work to close the game from the taskbar, as my desktop was hidden behind the frozen game screen.
Game version is GOG's 1.19.