Originally Posted by shiiinichi
This is also happening to me as well. J730G/DS
I had that exact effect some time ago on my Tab S3 after a Magisk update (not sure which one exactly but I think it was the one which introduced auto MagiskHiding of all child processes forked from process added to MagiskHide list). In my scenario, it was caused by enabling MagiskHide for any (e.g. at least one) system package that is being executed as a fork of Settings package, like e.g. SysScope or Device Maintenance, and even after selecting Settings app itself alone. I feel that the issue is caused by some issues in communicating between hidden and unhidden processes/namespaces - something like they had been starting in separated sandboxes, belonging to different UIDs that can't share any private data with each other - and is 100% samsung-specific. Just look at the screenshot again - Settings app can't obtain data from CSC system app, and is acting like there was no CSC flashed at all, so it's displaying some random default options set instead of settings specific to your region/CSC... Anyway, my solution was to remove all the critical system apps - including the Samsung ones like mentioned CSC or SysScope - from magiskHide and keep it enabled only for the apps that really require it, like Google Pay or banking apps (in fact, there is no real reason to select any of them. Almost all samsung apps works flawlessly even without being added to MagiskHide, and those which aren't working (Samsung Pass, Secure Folder) won't work even if added to hidelist...
Alternative solution is to downgrade to Magisk 16.x which wasn't behaving in such a way. I'd prefer the 1st option though.
The rule I learnt while using magisk on Samsung hardware is 1) to magiskhide no more apps than needed coz they won't be able to "speak" with each other and 2) not to enable too much modules at once as mounting systemless content won't finish before proceeding to the next boot stage, resulting in apps being run in inconsistent environments (and that results in random root losses and huge lags).