if you have a working repeaters or an observers at loaded chunk and then you unload the chunk and then load it again the observers or the repeater that were powered would stop working. And there is no way to start them again.
here is the sequence to reproduce the issue:
put repeater/observer on loaded chunk
activate the repeater/observer with a redstone pulse
leave the chunk (that leads to the chunk to became unloaded)
come back to the chunk
the repeater/observer still powered but wont output any redstone signal
even if the repeater/observer will be replaced, the replaced unit wont work.
Thank you for your report!
However, we are already tracking this issue, and this report is a Duplicate of MC-147818.
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