when I read fp3 + screen + static I remember this thread about a loose screen connector - Screen shows random noise ~ snow (after fall)
you already exchanged a lot of parts and should’ve fixed a loose connector as side effect and you have no issues during early device startup and in fastboot.
Did you scavenge the Fairphone forums for your symptoms already? a video demo is a good idea if you have a secondary device to record it.
(the 47% seems fine to me, that is a common display of fastboot actually finishing the partition write)