@monsieuricon @josh I cross posted this on r/androiddev and someone suggested that this could coincide with the recent (beta) release of OxygenOS 15, which I doubt because you said this has been going on for months...
However OxygenOS 14 has started its widespread rollout in March 2024. Maybe that fits your timeline better?
I guess some OnePlus user on OxygenOS 14 could check with Wireshark