Regarding the warnings, yes unfortunately that seems to be expected, see more info here HALC_ProxyIOContext::IOWorkLoop: skipping cycle due to overload
For the priority inversion, is it possibly due to one specific plugin? can you narrow it down at all? maybe remove all the plugins and perform the scan again, does it still happen? If not, gradually add them back in, if you have lots of plugins try a binary search.
There’s more info here regarding debugging a priority inversion issue like this Diagnosing performance issues early | Apple Developer Documentation