No, actually it was. I just tested it and it works as intended on ultra power saving mode. I did have this problem (off stone placement) before and I solved it by doing exactly what I described.
It reliably happens in Chrome when I zoom, and it’s probably because the javascript “board positions layer” does not scale proportionally to the “displayed board”. We can see the visible board is not automatically aligned with the stone placement layer if we rotate said visible layer.