with item frames when its on a block with an item is inside it, and a there is a comapator behind that block it bugs. when u load up the world you get extreme lag, then the item frame will duplicate itself and the item within it, into hundreds of items and crash the game. at the same time all the hostile mobs duplicate in caves. this occurs when the item frame is on a chunk border and the compartitor is in another chunk
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Incomplete without a crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt). Please attach it so that we can diagnose your issue.
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