Steps:
Place a image or a item frame on a block
Place a piston in front of image or item frame
Power the piston
Let the piston retract
IMPORTANT: I know that the item fram will be broken if a block is in front of it. But if you retract the piston the item frame will be updated somehow and breaks always and immediately and not after a random time span.
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I know that the item fram will be broken if a block is in front of it. But if you retract the piston the item frame will be updated somehow and breaks always and immediately and not after a random time span.
I don't think it's the piston retracting that's causing this. The problem seems to be that you're putting a solid block in the same space as an item frame. This will always cause the item frame to break after a short delay.