Thanks to your suggestion I found a way to disable the predictive text feature in the markdown editor. While this is not the perfect solution, it does at least seem to fix the issue for now.
I’ll keep looking for a better solution, but in the meantime I’ll try to have a new app update ready in the coming week that includes this temporary fix :D
I think there might’ve been some changes with regards to 2FA and Lemmy v19. I see that feddit.uk is running v19, so I will double check if I need to update my 2FA implementation (: