So you're not getting any 5G at all? I had this issue.
Try dialing *#*#726633#*#* to disable 5g SA check. That should give you a manual switch you can flip to enable SA (in the mobile network sim setting if I recall). I had to do that in order to connect to 5G.
(Note, at my home area, I was unable to get 5G to connect at all until I did this. Even after doing this, I couldn't get NSA to work at all. I think this is because I'm on tmobile in the US and there is only one 5G band available. However, i was in europe this week and notice NSA working too. I didn't try switching off SA to see if NSA still worked though.
Anyways, worth a try.