There was a controversial finish in a Canadian championship, where an opponent [un]knowingly held the queen of the other player. The [victimised] player wanted to promote his pawn to queen, but couldn't find it. Due to time pressure, he used an upside down rook instead of a queen.
The arbiter didn't allow this and the player ended up losing the game. The decision was not reversed even though there was a video evidence of the event.
In many chess videos, I see that even the great world champion Magnus Carlsen holds the opponent's pieces in his hands, of course without any ill intent.
Is there any rule or guideline for this?