My plugin worked under 4.x but doesn't work in 5.x (it doesn't show up in the field list).
I updated it based on the changes I've seen in plugins that have been modified to work with 5.x but no dice. I can't find a single example of a third-party formatFields plugin.
also this doesn't make sense since to use Private the usage would have to happen inside of the definition of the HTMLFormatProvider, which never gets called because it isn't registered... so I think you're wrong, unfortunately
another wrinkle:
if I import ui/stringify/register in my file then I see that all of the field types appear in the list on the field editor page twice, but mine still doesn't.
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