When a comparator is on, changing its mode will cause it to flash off for a moment. This is purely a visual glitch. It only occurs if the comparator is receiving information from a block with an inventory, a detector rail, or a command block.
MC-99607
Comparator flashes when changing modes
Resolved
Awaiting Response
0
Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time.