It seems this issue and a previous thread’s issue is the same (or at least potentially similar)? (my response to that thread:[RESPONDED] Section of right-side of the keyboard no longer works - #10 by FaultedBeing)
But, a work around that I found that fixes it for anywhere from a day - 3 weeks is by giving a solid full handed press down on the section of keyboard that doesn’t register and then typically the keys will start working normally.
The occurrence of this issue on my device has happened less frequently over the last month than it was a few months ago, but my work around always worked decently enough so I never bothered to contact support (given I am also significantly out of warranty lol (3+ years))