Solved!

I really thought it was a cartoon, but I surely did hear about this and it fits really well, so thank you.

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Not a cartoon, but in Minecraft the parrot mob could be bred/healed(?) by feeding it chocolate chip cookies. Then people complained that impressionable young children play the game and they might mimic the behavior and kill their pet bird. Now feeding parrots cookies will kill them.


I think it was from an anime, but I don't remember for sure. It was talked about in a video about "censorship".

[TOMT] Cartoon dog/cat shown eating chocolate chip cookies before parents complained that kids might feed chocolate to their pets, so it was changed to something more typical and safe for the animal.