Github integration gives "unknown error"

**Describe the bug**
We're using the Github integratiion extension.

Despite having installed the application at the organization level with access to all repositories, we were not seeing the repositories A and B, both being "forks" from another repository.

After trying several back and forth, we're now in a stuck situation where the application cannot be used at all.
I even tried to remove the app from the organization, to no avail.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to a room
2. Click on "Add widgets, bridges and bots"
3. Select "Github"
4. After some waiting time, "Unknown error" is displayed (see screenshot)

**Expected behavior**
Credentials being asked and full visibility on repositories under the Github organization.

**Screenshots**

**Client (please complete the following information):**
Element version: 1.11.61
Crypto version: Olm 3.2.15