Movement stutters when trying to instamine blocks when the tool/hand tries to mine blocks of an other type behind/below the block that was just mined.
Easy ways to recreate:
Mine crops in a line while moving forward and looking at the dirt below the crops (see attached video).
Mine sand with an Efficiency 4 shovel with stone below or behind, pointing at the stone.
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[media]

Forward-resolved to MC-156451.