When the Gold tokens are created from creatures with Old Gnawbone in play.
The time it takes to create a new Gold token is required for every token, regardless if there is actual room for the token on the board or not.
In my video I have creatures attack,
Octopi tokens (32/32), Shimmer Dragon (13/15), Old Gnawbone.(28/28)
The board has 49 gems, 13 of which are planeswalker gems, 3 already have supports on them, leaving 33 available.
The Octopi token hit and add 32 gold to the board
Shimmer Dragon hits and adds 1 gold to the board then waits
Old Gnawbone hits and then waits
Basically, the game is performing the wait time for the Gold creation animation, even when the animation isn’t done.
Here is a video of what I’m describing