As of build 23E214,21T216 the issue is fixed.
fsauter
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Just FYI: I reported a related issue using the feedback assistant and as of build 23E214,21T216 my issue is fixed. Maybe this helps!
Thanks a lot for your reply and especially for the book suggestions! :-)
I don't think that I can use the Mach API directly, because obtaining the Mach task_t from a PID requires special entitlements that I cannot afford to assume in my case.
Do you know whether there is a relationship between the task priority from proc_taskinfo and the process priority from sysctl?