It may just be time for you to try re-installing Mojave. Can't hurt...may help.
I've done that a couple of times, using the Recovery Disk, to have only temporary respite. I thought the Combo might catch something a regular update might miss but, given this hiccup, I guess that's out. I'll press on in the other thread.
ryck
"What Were Once Vices Are Now Habits" The Doobie Brothers