When I make a fast piston/slime clock, using the new slime block features, when I break the slime block, it creates lava partcles instead of slime block particles.
Edit: I just noticed it happens when you break other blocks, the redstone block, for instance.
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Might be a duplicate of MC-47105, although it isn't happening with the Piston itself it's still using the same blocks to move the slimeblock structures I guess.