So I've not done the good testing to prove my theory yet. Hoping one of you recognizes the symptoms and can say that I forgot to do X, misconfigured Y or some such thing. Too many of you seem to be having great success for me to believe I actually found a bug.
I have an XSL which has several functions inline in the XSL. I have XProc tests which were working under Oxygen 20 but now choke In Oxygen 22.1 I'm not positive what versions of XProc those two Oxygen versions correspond to.
The error appears to be that the functions are not in the compiled XSL so all the calls to them choke making the compiled XSL fail to be able to execute.
Thanks.