Are you using a downloaded theme or a 3rd party launcher @Mikey990
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help.
I have the same issue too.
I have tried changing my mode from dark screen to normal and back again, to no avail.
I restarted my phone and it turned white whilst it was loading and then defaulted back to black once it had loaded.
Did you ever find a solution to this? I have the same issue. Everytime I open the Keyboard, the icons and text turn black and I have to pull down the notification bar for it to back to white.
It happened several months ago and then just stopped. Then it started happening again right after I started using Dex.
I'm on a Note 20 Ultra, stock launcher and Samsung Keyboard.