I received the subsequent update this morning (although it seems as though phones receive it in batches rather than all at once) and all seems to be working fine now.
Model: SM-G960U1 (US unlocked)
Old Baseband version: G960U1UEU6CSH7
New Baseband version: G960U1UEU6CSI1
Country of Use: Australia
Service Provider: Optus
I am on a Galaxy S9 with the most updated software as of December 1, 2019, and I am still having this problem. It is worst when I'm connected to wifi, forcing me to pay for data if I want to use internet or social media apps. Horribly intrusive. Slows down the phone, interrupts typing, and touch screen actovity with constant pop ups that I can't deactivate, even by disabling all notification permissions and not allowing it to appear on top of other apps.
Has the bug reemerged? How do I stop it? Was a solution ever found?