Chatterfang Ugin Bug
This is a glitch that happend on my android. When Chatterfang triggers off of Ugin token production, it produces a squirrel token. Whenever the squirrel token dies, it triggers Ugin to give you the exiled card under the Ugin token. This is supposed to only happen if the Ugin token leaves the battlefield, not the squirrel token.
I think this bug also sets the ETB parameters, as well. If a token enters the battlefield tapped, the squirrel tokens produced also enter tapped.
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Phoenix#14287 commented
I can confirm, I just had this happen to me and was coming here to report it.
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gtol#44059 commented
Chatterfang's ability is a replacement effect, which means while it is on the battlefield with Ugin, you can imagine Ugin's ability says
"Exile the top card of your library face down and look at it. Create a 2/2 colorless Spirit creature token and a 1/1 Squirrel token. When a token created this way leaves the battlefield, put the exiled card into your hand."
You can read more here https://mtg.fandom.com/wiki/Replacement_effect if you are interested.