If repeaters in sequence transmit rapidly alternating signals in sequence, the repeater that does not have another repeater in front of it (marked with a redstone block) remains stuck in the "on" state, causing all other repeaters to remain stuck as well on the same state.
The bug also happens if comparators (in both its modes) are used to lock the repeaters and happens in all directions.
My bug has already been reported by this one
MC-54711
I haven't found it when i seached, sorry