I’d been using the Upsert catalog object just fine for years and hadn’t realized the description field had been deprecated. Only started investigating it because lately I noticed that anything added now just has the HTML code in the description when viewing it in Square. So I see that description_html is now what we’re to use, which is fine. So I go into my code and add _html to the preexisting field and now when the code runs it adds the catalog item but completely ignores the description field?
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Based on the information you’ve provided, the following documentation will help answer your question:
Additional Documentation
Synchronize a Catalog with an External Platform
Categorize Catalog Items
Add a Catalog Item
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What’s your application ID? 
sq0idp-Yrrrvui1jKbXT1NB5uizpQ
Just checking in – Any luck?
Thank you so much! It was in the right position, but it was the Square version that needed to be updated!
Glad to hear that you figured it out and thank you for sharing your results.