so, real bug exists after all:
normal paused game looks like that:
but game with undo request looks like this:
text of who to move disappears
also, there is usually the last move indicator on 1 last stone
but here both stones are identical
so, last move indicator literally disappears
in both games:
Analysis and conditional moves disabled
so someone who plays without it usually don’t press arrow buttons and unlikely to think about this list of moves:
@Eugene , that is why everyone is confused and everyone can timeout !!!