I am frequently getting intermittent issues with observers getting 'stuck' in a powered or unpowered state.

Specifically, I am using the observers as part of an item elevator, as per https://www.youtube.com/watch?v=tVz7THKZuWE.  However they frequently get stuck and no longer respond to updates in power from the redstone, this is true of both the upward facing ones with redstone (or redstone torches) on them, also the horizontal ones.  When you look, you can see they are stuck on (or off).

This seems to be a duplicate of the Java edition bug https://bugs.mojang.com/browse/MC-110552 

Initially, I thought it might have been because of an update, or because I temporarily dropped from survival (where I play 95% of the time) to creative.  However, it's happening quite frequently.  It certainly seems to happen a lot more if items are travelling through the elevator (that is the redstone is ticking) when I quit the game.  Perhaps there is something in that?

To aid in debugging I've opened the world in creative, taken out some blocks to show many of the observers working correctly (ticking), and one stuck.  Then me breaking the observer and replacing to show that it 'should' be been updating.  Hope that helps, or at least proves it really is a bug  (attached video)

This is basically making the game virtually unusable for me, I have been building item elevators as part of a sorting system using observers as we can make silent item elevators this way.  However, I now spend 50% of my limited game time just manually removing the observers and replacing them, mainly 'debugging' the system due to this bug, not much fun TBH