BUG - Progenitor Mimic copied on the stack died improperly to state-based actions when copy and original copied two different legendary creatures

[Athanar90]

SITUATION
-Volo, Guide to Monsters exists on the battlefield under player's control
-Player plays Progenitor Mimic without another Shapeshifter in battlefield or graveyard zones
-Volo triggers and makes a copy of Progenitor Mimic on the stack
-Token Mimic selects a legendary creature under another player's control and enters successfully
-Card Mimic selects a different legendary creature and enters, then immediately dies to state-based actions