SharePoint Group - Access Denied

[Windows 11]

I created an additional SharePoint Group in a site and added a user. I set the SP Group as Read at the site level, but Contribute in certain libraries. User is receiving Access Denied for site link. Intermittently the library links works. During investigation the group disappeared in the library permissions and needed to be re-added. I had created a SP group in a test site a week or so ago and all worked fine and the current site with the issue. Today the test group in the Test Site is still working, but if I create a new one just like I did a week or so ago, the user is getting Access Denied.

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