This seems to have fixed it for me. I was seriously starting to doubt myself lolFor a temporary fix,
go into the 'Display' menu in settings,
under 'Advanced' click on 'Colors' and select a different color scheme.
You can also go back to the original after that if so desired.
This fixes it for me until the next reboot.
Didn't happen with LOS 17.1, started seeing this when I went to LOS 18.1
I also found this problem. However, the remedy given as 'settings -> Display -> Advanced -> Colours -> Cycle between the Natural, Boosted and Saturated options fixed it for me until I rebooted the phone. Makes me wonder if there are some lines of coding that could be looked at with the controls of these options. Hope one of you clever guys can find a solution. Otherwise - Android 11 is working fine. Running LineageOS18.1. Thanks in advance. Ron
As of the LineageOS18.1 May 15th 2021 update, I lost control of my SIM, the system saying that the SIM could not be found. A hard reset did not fix this either so I started afresh with boot into TWRP and wiped everything, then re-installed the first LineageOS18.1 I had downloaded to my sdcard. Voila! the system then found my SIM card again, but then when I allowed the system to upgrade to the 15th May 2021 release my SIM detection failed again! I have the wifi connection but am stumped as to what to do next. My contract is due for renewal in June 2021 so I think I'll buy a second hand Samsung instead. Any further advice anyone?