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Yep removing specialai got rid of them. The config option for just that behavior I bet is ai_throw_player. I didn't have time to check it though, but removing specialai mod got rid of them and and a lot other stuff I'll want back.
I dug 64 blocks north along the top of the gravel layer, still nothing. It's not a big deal though, I can just get more lava from the ex nihilo crucible.