Following up, as noted in the bug report ( https://bugzilla.redhat.com/show_bug.cgi?id=1860479 ) this doesn't appear to be oVirt / VDSM having issues. You can replicate the same inability to attach a bond to a bridge by simply booting the 8.2.2004 installation media and trying a few manual 'ip' commands. With older 8.1 or any 7.x install media, there's no problem, but starting with 8.2, you can't attach a bond to a bridge anymore.
It looks like there may be some similar reports on bugzilla recently. I just wanted to note here on the list that this isn't an oVirt problem, looks to be an issue with the OS (kernel?).
Thanks again!
Mark
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