when in single player mode destroying a mushroom block and then replacing the block in a mushroom block superflat world crashes the game.
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Same cause as MC-93161: An avalanche of block updates exploding the stack.
It's WontFix.
Please attach the crash report.
I can tell you, it's because the block you place causes the blocks around it to change (change the side to pores) and they, in turn update their neighbors, etc. it MAY be fixable by adding a limit of block state updates in a single tick.