I just got through updating to Drupal 10.2.3 and Groups 2.2.2. I was previously running D10.1.8 and Groups 1.x and this all worked.
Now I get an Access Denied / You are not authorized to access this page. error on the group's main content link: group/3/content/ and when I try to add content, it only has options to add a Forum or a Forum post only. Previously, it used to allow me to add blog posts as well.
In addition, now I don't see Group Node under permissions at all. The Group Node module is enabled.
ETA: I also tried rebuilding permissions for the site, which didn't fix the problem.
Navigate to Group content create page, e.g. group/3/content/create
This page now only shows Forum-related options:
Figure out how to get back the Group Node creation and permissions functionality.
Fixed
2.2
Code
I solved the problem. Somehow, during the update, the group's permissions at /admin/group/types/manage/my-group/permissions lost the checkmarks for the group admin to create and edit blog post content. After I restored the permissions, I can now view all the group content and add all the content types I could before.
Automatically closed - issue fixed for 2 weeks with no activity.