Oh huh, for that case, name:right and name:left are supposed to indicate what the name is on each side (relative to the direction of the way). Which of course, is also a colossal pain to do. Semi-colon delimiters in name tags throw a warning in JOSM because you're supposed to use the various ???_name tag variants to store alternate names. So I guess I'm not sure what properly belongs in the main name tag in this case, but :right and :left should be the proper way to do it. See https://wiki.openstreetmap.org/wiki/Key:name:left

Some data consumers can handle the semi-colon just fine:
https://americanamap.org/#map=18/43.500441/-96.587423

Some data consumers (notable the standard tile layer cannot:
https://www.openstreetmap.org/#map=18/43.500776/-96.588659

So this might be a good broader question to ask. I would be fine with putting back the semi-colons but I expect it will come up again because of the validator warnings.