I have the same problem! I'm running 8.0.15 and I've had this issue since upgrading to 8.0 from 7.1.
I only have this issue on firewalls with HA. I can get the commits to go through after restarting panorama.
My TAC case is about 3 months old at this point.
Edit: I never see the commit hit the firewalls, it stays in queue on the panorama.
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