It doesn't seem isolated to just this release, as it shows up on other devices/ports. I just wanted to post here in the event it helps someone else.
A fresh flash to 4.3.0.12 doesn't suffer from this problem. Confirmed everything works (including MMS and camera!) with a fresh 4.3.0.12 flash on my Xperia XZ2.
OTA to latest breaks MMS (see: my post on forum.sailfishos.org).
It doesn't seem isolated to just this release, as it shows up on other devices/ports. I just wanted to post here in the event it helps someone else.
A fresh flash to 4.3.0.12 doesn't suffer from this problem. Confirmed everything works (including MMS and camera!) with a fresh 4.3.0.12 flash on my Xperia XZ2.