After the 1.16.0 update the problem still exists (1.16_obserror.png) but has gotten worse.
When I replace the observers the red dot disappears but the observers are still broken and don't update. This happened after closing the world/Minecraft and opening it again.
When I build another observer clock some blocks apart from the affected blocks it works until I close Minecraft and start the world again.
This is total crap because everything with observers is now broken and there are corrupted block spaces everywhere.
I tried to reproduce the wireless redstone bug, this doesn't seem to work so it has nothing to do with that behaviour.
This applies to both BDS and Windows 10 independently with the same map.
Is this finally fixed in 1.18.10?
The changelog suggests something like it.