I did a clean flash. Wiped everything except for my external SDCard.
My mobile connection does not work

I tried a second SIM (my daily) and that also did not work; so either my spare/test device has recently broken, or there is something flakey with the ROM. But, I am guessing its working for everyone else?. Although I did not use it for long before I flashed Magisk, I have a very vague memory that I did get an LTE connection before I flashed Magisk, but I am not sure.
I am also having strange problems with WiFi. I use a MAC filter on my WiFi, and as such, I selected the "use device MAC" on my WiFi connection on the phone (thereby using the allowed / known MAC from previous ROM's). However, It could not connect to my WiFi. So I turned off the MAC filter on my modem, and I could then connect to my WiFi. I then checked what the phone was connecting as, and it WAS the MAC address I was already allowing to connect to my WiFi. So I switched the MAC filter back on in my WiFi modem, and then my phone could not connect!! its as if it is trying to connect / authenticate using a different MAC address, to what it uses once it is connected

Effectively, WiFi does not work for me.:crying:
I also could not actually even see any GPS satellites, let alone get a fix:crying:
And just as I have found in Android 10, I think the album art is broken. If I am correct and it is broken, this is a problem with AOSP as well as LOS (i.e. the source for crDroid)