Converting ODDs to PDF in Oxygen currently fails with the bleeding-edge plugin. Try:
TEI/P5/Test/testcorpus.odd
You get: "Effective boolean value is not defined for a sequence of two or more items starting with a boolean" in fo_figures.xsl line 336
Try:
TEI/P5/Test/relatedItem.odd
You get: "A sequence of more than one item is not allowed as the result of function tei:generateRefPrefix() ("relatedItem", "relatedItem")" in teiodds.xsl line 2382.
Could someone running the stable plugin and someone running with the default Oxygen framework in 18.1 please test and report back?