Any "block" that doesn't take up a full block (torches, flowers, buttons, redstone torches) can be erased or overwritten by placing redstone on the block below it.
To Reproduce: Place lever on block, then attempt to place redstone on that block even though there is a lever on it.
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Ezekiel
migrated
Duplicate of MC-68718 – If you have not, please use the search function in the future, to see if your bug has already been submitted.