User can no longer access private repository after upgrading Sponsorship Tier

[ptrumpis]

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I'm having two monthly sponsorship tiers and both of them give access to a private repository.
Everything was working fine ever since until today when a user upgraded from one tier to the other.
The user reported that he can no longer access the private repository.

My first thought was he might forgot to sign-in to GitHub.
But I also checked "Collaborators and teams" of the repository manually and the user can not be found.

Could this be a bug?
Maybe some sort of race condition if 2 tiers give access to the same repository?

Possible scenario:

1. User upgrades to another tier
2. Tier I queues removal of repository access
3. Tier II queues grant access to repository
4. Tier II "grant access" queue executes first
5. Tier I "remove access" queue executes second
6. User has no access due to race condition

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[josting62]

ok, thank you very much for your notes, but how could I as a new user in GitHub have sponsors, since I am very interested in having participation in the different projects that I do and that have a rewarding and positive impact?