I've noticed that my notification quick actions are now showing as blank since I installed the OneUI 6.0 update a few weeks back. I can still interact with the buttons, but can't see what they say. Has anyone else seen this or have a fix?
3rd party or Samsung apps? 3rd party apps could suggest further improvements needed by the developer. A bit drastic but could also try full reset back to factory state.
Hmmm, sounds like a problem specifically with those apps and not your phone (hopefully). You could reach out to the developer of those apps in the hope they issue a fix. Have you looked at the feedback of those apps to see if it's affecting anyone else with the same handset?