I hear you ... probably a project moved to more than 1 team and some code or structure was kept, but not looked into further on each set of teams on the project for development.If I disable lock screen notifications, Edge lighting will still trigger when the phone is in use.
I researched this for a while and the only workaround was to download a 3rd party notification app which would wake the screen about 60% of the time, rendering it useless.
It boggles the mind that Samsung see fit to have so many options and tweaks available but obviously waking the phone on notification receipt like iPhones and Pixels is deemed a step too far.
Man if I could get in as a project manager I'd ... but wait hold up!