Interesting. It does the same thing with Futo keyboard. And no other app exhibits this behavior, so I'd put the fault with Primal.
This is a known issue with GOS. I use https://github.com/Julow/Unexpected-Keyboard and it works fine. There are others that have been found to work, also. Remember to kill their network permissions, though.
Discussion
Don't know about that one, but I tried a couple that worked and a couple that didn't. Unexpected Keyboard is an easy one to install and try just to troubleshoot. No permissions requested other than sensors.
You could also use Amethyst and get the same behavior.
I did just install it. Thanks. No autocorrect is a deal-killer for me, personally, but I can see how it would be useful in termux.
Try out Futo. I'm super impressed.
I'm sticking with nostr:npub1yzvxlwp7wawed5vgefwfmugvumtp8c8t0etk3g8sky4n0ndvyxesnxrf8q for now.
So just confirming, Unexpected Keyboard also did not work in Primal?