@MrWhiteman.
I don't get green, but a "warming" light glow, more pinkish than yellow.
I've been messing with the FW before and oddly, I found the first time I went from 1308 > 2021, I had no camera tint. I then reflashed again from another PC with 2021 and voila!, yellow tint.
Now it won't go, but since it's a know about and easily corrected issue, I'll just wait for the bug fix.
As to getting back to 1308, I previously flashed via NSU for Retail when 1308 was out and it stores the package on your PC. I knew once the next update was out, I wouldn't be able to download it anymore.
I then deleted the 2021 FW from it, leaving only 1308.
Loaded up Nokia Care Suite and installed 1308 via the recovery option. You have to flash as a dead phone though by holding Vol. down & Power til it starts the process. Went in no problem.
Hope that helps.