I would suggest you contact the editors of the Scott US Specialized Catalogue and ask them the question. Perhaps they decided that OX36 was a perforation variety of the same stamp as OX 37 and not a regularly issued seal or they could find no examples of OX36 and delisted it. It appears from Kotanchik's book that a number of perforation varieties exist on that issue.
**update** After some back and forth with pictures and measuring, Scott has decided to put the OX36 back in for their 2021 catalog based upon my stamp. Not gonna lie, kinda cool to get Scott to change something.
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