I've installed both the beta and the dev version and am having the same issue.
When logged in and I try to post a comment I get a red box with nothing in it, i'm assuming that is an error. I can see the comment in the backend, but it's not showing up and I get the following in the logs:
Error: Call to a member function model() on null in Drupal\react_comments\Plugin\rest\resource\Comments->post()
When trying to post as an anon user I get the same red box but with the following message in it:
Contact info for anonymous users is forbidden
Nothing in the logs.
I have checked the permissions and everything looks okay.
Any ideas?
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It's likely this issue predates Contrib.social: some issue and comment data are missing.