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Looks like they may have made a fix on their end for this, as it's suddenly working with no change on my part. Thanks for your help!

So, these are both paid upgrades, which is fine – but I know for sure that I've done this before without either of these addons. Are there any gotchas that you can think of that I'm just doing wrong? Even on this site, I saw them show up for a moment, and then something broke it (not sure what I changed).

EDIT: just realized that the integrator actually is the same addon for Admin Columns Pro that I already have installed.

UPDATE: I don't think this probably solves the underlying problem of users coming disconnected from posts, but I did add this, which makes the invisible users visible on the edit screen for Projects (the CPT they're connected to):

'field' => [
'query_args' => [
'number' => -1 // This
]
]

https://gist.github.com/jonschr/62768067928ced1d501d14fe7e7b138c

Looks like that worked! Thanks so much. So far, so good – love seeing you guys step in and fill the gap created by P2P no longer being supported. This is the first time I've run into a case that P2P just didn't finish the functionality for, and you guys are the only ones I've found who have it (the connection to users was never quite finished in the P2P plugin).

One question: is it possible to see and edit the posts_to_users connection on the "Create user" interface in addition to the "Edit user" interface? I'd love to have it in both locations.