Now on my 12 pro with a Xiaomi EU rom "Restrict background apps" works which was not the case at the beginning, the samsung have or had the same problem.
Well then I'm gonna give the newest stable eu a12 rom a try. I hope you right and this notification problem won't be present. Thank you the answers!
Some apps must be in automatic start and no restriction on the level of the battery saver, for example Google messages or apps for connected bracelets (Zeep) or sometimes email apps, to sum up check the permissions.
And how do I know which apps need these settings (autostart and no restriction)? With global rom Facebook messenger, Signal and some of my games couldn't send notifications and probably some other app I don't know about.
Notifications and autostart working properly are two different things.
Your warranty might not be void (thanks Xiaomi). However... I am not responsible for bricked devices, dead SD cards, thermonuclear war, or you getting fired because the alarm app failed. Please do some research if you have any concerns about features included in this RECOVERY before flashing it! YOU are choosing to make these modifications, and if you point the finger at me for messing up your device, I will laugh at you.