I hope I don't come off too negative with all these bug reports; I am just playing a lot of this game!!
The zig-zag tetromino in the final tetromino puzzle reliably stops too early while I am dropping it into place. Rotating gravity out and back again causes it to go where it belongs.
I could have sworn I encountered this at some other point in the game, but I can't think of where it would be.
It's possible that this could have something to do with the water that is now flowing over the tall tetromino in that puzzle - I haven't tested without the yellow cube activating the floor. But I would still expect to not have to toggle gravity in order to get the tetromino in place.
Windows 10 Home version 1903 (build 18362.10024)
Intel Core i7 6700K @ 4.00 GHz
Nvidia GeForce GTX 1060 (6GB)
Game build: 126.96.36.19975 (I think)