There is a defect in how membership system behaves when the public room creator leaves and tries to rejoin the it again.

Steps to reproduce:

1. User creates a public group chat with any number of other invited users.
2. Any number of users or at least one should accept the invitation.
3. Creator changes image and/or group name
4. Create leaves a room
5. Someone invites the creator back to the room-> the creator can see the invitation
6. Creator refreshes the page -> and the invitation is gone.

This problem happens with multiple sessions. Example: the creator might have like 4 other session in different browser. And for 3 of them this issue happens and the 1 is alright.
Note: In Element Web Client the invitation after refresh flashes for the fraction of a second and then it's gone.