If you are seeing this, the issue for me was caused by an incorrect URL for UserInfo....
I had:
https://xyx.amazoncognito.com/oauth2/UserInfobut it should be:
https://xyx.amazoncognito.com/oauth2/userinfo
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
If you are seeing this, the issue for me was caused by an incorrect URL for UserInfo....
I had:
https://xyx.amazoncognito.com/oauth2/UserInfo
but it should be:
https://xyx.amazoncognito.com/oauth2/userinfo