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Wtf lol... was anyone else not able to split at all after a certain point in the game?

What happened exactly? Everything was fine for me. In case if you were in 16 and someone ate 15, then you can't split. It's a bug.

Oh, maybe I was on my last piece, it was odd because I had time to grow in size a little.

Could be the case. That's when I can't split. It seems it waits for the time to go back together even if someone ate 15 out of the 16 pieces.