Plugin update in the hub removes notification all other available updates

I just came across an issue.

When I update ONE plugin via the hub, it removes the update-notification for ALL OTHER plugins on that site as well.

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In the WP backend the other update(s) are still showing.

I was able to replicate this behaviour on all sites, with different themes and plugins, as well as on another WPMUdev account.

Any suggestions on that?