Few 500 error requests after login

Reproduce step:

• Login using a non-Nuxeo user
• Go to /nuxeo/designer with inspector opened (network recording)
• there is ~4 requests to GET /nuxeo/site/connect that returns 500.

It seems related to a GET /nuxeo/api/v1/user/<username>; that sends a redirect to /nuxeo/site/connect in a fetch.

Investigation:

• Seems related to the new header bar either in Studio, either in Designer.

Impacts:

• Production monitor of 500 HTTP is triggered several times a day for a false positive.