(This came up during a game of Momir, and I'm posting this from the Victory screen several turns later. I don't recall all the card names, and I can't pull the log for you. Hopefully what I remember is enough for a repro.)

Step 1: Your opponent has on the battlefield (inter alia) a token copy of Riptide Gearhulk. You have a (inter alia) a 3/1 Dinosaur token and a token copy of Frenzied Devils, neither of which is sick from summoning.

Step 2: You create a token copy of Perforator Crocodile, through the Momir emblem ("Pay X, discard a card: create a token copy of a random creature card with mana value X...."). The crocodile's ETB ability triggers, conjuring a Stab Wound onto (inter alia) the gearhulk.

Step 3: Attack with the dinosaur and the devils.

Step 4: Your opponent blocks one of the tokens with the gearhulk.

Step 5: The gearhulk dies from combat damage.

Expected Step 6: The conjured Stab Wound is placed in the graveyard.

Actual Step 6: The conjured Stab Wound vanishes as though it were a token.

(I wasn't able to check if the Stab Wounds had "Token" on the type line before they vanished, sorry.)