The pictures are not blank. They just look like that for a bit. I don't know why but after a while the pictures also show up correctly in the gallery app. Also when opening them from the camera app they are shown correctly and when sending them they are also fine. It just seems to be a bug in Android where the file isn't properly updated in the gallery view.
Connection issues are known and seemingly related to IMS. Can't do much here although I (and others) are working to try to resolve this. Try turning off IMS features (in XperiaParts) and see if the issue persists.
I don't boot into the stock when trying this so the /data format that newflasher does ("erase user data" option) is enough. I also don't use Magisk especially as last time I tried that it bootlooped. Maybe try again without Magisk. Note that the ROM passes safetynet without any modifications so you don't need Magisk for that.I tried at least 2 times reflashing .228 full firmware with newflasher, right after successful boot and basic setup rebooted into fastboot mode, flashed latest official TWRP, format /data, reboot again into twrp as suggested by twrp, wipe /system, /cache, installed this rom with magisk 25.2, again wipe /cache and reboot. I will try again reflash stock .228 but i suppose it will be same.