Avoids collection was modified issue when flowing identities to the authenticated user's principal#18527

AndyButland merged 1 commit intov13/devumbraco/Umbraco-CMS:v13/devfrom

v13/bugfix/fix-issue-with-iis-basic-auth-and-backoffice-loginumbraco/Umbraco-CMS:v13/bugfix/fix-issue-with-iis-basic-auth-and-backoffice-loginCopy head branch name to clipboard