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I don't have an archived version of the old metadata file, but several of the columns called in listCensusMetadata no longer exist (including "datetime" and "validValues"). Took a guess and replaced references to "validValues" with "values" and everything seems to be working, at least for 1- and 5-year ACS.
I didn't mess with anything else (e.g., reference to "datetime" is still there) because I wasn't sure if this would inadvertently affect other APIs (after skimming other APIs, doesn't seem like it would).
Hope this helps!