Avoids collection was modified issue when flowing identities to the authenticated user's principal #18527
+7
−1
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Prerequisites
Resolves: #18509
Description
It looks as if #18206 introduced an issue in this situation, where you have a user authenticated via IIS basic authentication before attempting to sign-in to the backoffice.
I haven't been able to reproduce it using the public access feature on Umbraco Cloud.
I've been able to reproduce locally: #18509 (comment) - so these are the test steps.
When I try this process again with the code from this PR in place, I no longer see the issue.