Lava+water no longer creates stone/cobblestone

I'm unable to reproduce this. Do you use any data packs? Is the vanilla data pack enabled?

Dammit, I forgot to try it in a new world. Apparently this is now an effect of removing water from the water fluid tag. I think that wasn't the case before and wasn't in the changelog either. I also didn't realise that I still had that datapack enabled, normally I don't do that.
Well, this can be closed then.

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We're tracking this issue in MC-123029, so this ticket is being resolved and linked as a duplicate.

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Well, that's not quite the right duplicate. Vanilla was enabled, the fluid tag was just overwritten with something empty in another datapack. But it's not really important, it was invalid anyway.