Just to double check, these are all off/disabled for lastpass, taker, and all auto apps, right?
System Settings -> Apps -> Gear Icon -> Special Access -> Battery Optimization
Phone settings > Battery > Battery optimization (the disabled apps show up in this list. Each of the apps should display here. If not, then -> three-dot menu -> All apps and disable them)
Finally, I think OnePlus has a recent app manager. If that is set to deep clear, you'll have the problems you describe.