I am also having this issue since updating to One UI 6. Only the app pop-up bubble appears, but not what the text says, and no edge lighting or anything else. I also tried changing it the notifications to "Detailed" but this did not work. It also seems to be intermittent as it rarely does show the edge lighting, but often not.
Hey there! I can absolutely understand wanting your favorite features on your device to work like they were designed to! Since this is happening after the update I would suggest clearing the cache of your device by following the below steps.
With the device off, press and hold the Volume Up key first, then the Side key. When the Android logo displays, release all keys and wait until you get the Android system recovery menu options. Press Volume down to highlight Wipe cache partition, then press Side key to select it.
I would also submit an error report by going to the Samsung Members app > Get help > Send feedback > Error reports.
Another possible cause is if you have changed the notification for the app to Silent. With Silent selected, you will only see the additional options of "Minimize notifications", "Show content on lock screen", and "App icon badges". If you select Alert (vs. Silent) you will see the option to toggle on pop-ups.
If you still want the notifications to be without sound, you can search the Samsung notification sounds and one of the options is "silent".
