When you try to craft something using a 4x4 grid within a single slot (not the crafting table), it will keep the original number of item and it will keep duplicating
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by_jove
The upper left slot of the grid works correctly. Place a log in the bottom left, bottom right, or top right. Remove the resulting planks, and the log is still there. Can move it around these three slots, but only top left does it work as intended. (Also happens in crafting table. Only top left works as intended.)
migrated
Duplicates MC-271398. Will be fixed in future update.