Facebook Group feed is completely blank/empty right after joining (but Featured posts and Member profiles work)

Hey everyone,
I’m running into a really frustrating bug with a Facebook group I recently joined, and none of the standard troubleshooting steps are working. I am hoping someone here has seen this before or knows a backend workaround.
The Problem:
Right after the admins approved my request to join the group, I opened it up, but the main feed is completely empty. No posts show up at all. However, here is the strange part that proves the posts exist and my membership is active:
The "Featured" Tab Works: If I click on the "Featured" section, I can see all the pinned posts perfectly fine (except for the absolute latest one).
Member Profiles Work: If I click on the profile of a member who posts frequently in the group, I can see all of their group posts—including their most recent one—directly on their group activity profile.
The Main Feed is Blank: The moment I go back to the group's main landing page, the chronological timeline is entirely blank, as if nothing has ever been posted.
Everything I Have Already Tried:
I have already ruled out local device/cache issues. Here is a list of everything I’ve tested that did not fix the problem:
Multiple Devices: I tested this on the Facebook Mobile App (iOS/Android), Mobile Web Browser, and Desktop/PC Web Browser. The feed is blank on all of them.
Feed Sorting: I tried switching the feed filter between New Activity, Most Relevant, and Recent Posts. It remains blank.
Notifications Trick: I changed the group notification settings from Highlights to All Posts to force a sync.
App Data Reset: I cleared the browser cache, cleared app storage data, and completely reinstalled the app.
Language Change: I changed my Facebook language settings (from US to UK English) to force a UI redraw on a different server.
Since this started the exact second I was approved, it feels like my account is stuck in an incomplete provisioning state where Facebook’s database knows I’m a member but is failing to generate a Feed Access Token for this specific group's main timeline.
Has anyone dealt with this exact "ghost feed" bug right after joining a group? Did it eventually fix itself, or is there a specific trick to force Meta's servers to rebuild my group feed cache?
Thanks in advance!