@DarkOverord It happens completely at random for me. Like it feels like sometimes if you misspell or repeatedly use words it doesn't recognise in one language, it starts using a different dictionary. It takes writing enough english again for it to fix itself.
I really hate how I can't just tell it to use a specific dictionary, it seems to be based on OS settings, but it's getting that shit wrong.
@DarkOverord Yeah, I once managed to solve it insisting in US english by having US english installed, then uninstalling it, leaving NZ english, but for like half a year now I've had this issue crop up like once a fortnight instead~.