It seems that the screenshot functionality is broken for version 14.00 on my Fenix 5x plus. It seems that there is some garbage in the first row, the begin of the image is shifted and the colors are wrong. Is this just for me or does anybody else experience this also?
As I read your post, I tried to make a screenshot 
. As I used this function several times in the past, I know that it worked well. Interestingly it was not listed in a change log of the last updates. I wrote a mail to Garmin Support.
Older screenshot:
