HTTP/HTTPS issues with SSO

I am unable to access communities some pages as the page stucks in endless loop. There are issues when opening http links while I am logged in bentley site using https. If I open links to communities from email notification which has http it doesn't work but if I replace it by https then page opens. Seems it doesn't correctly forward to https.

examples:
communities.bentley.com/.../99075
communities.bentley.com/.../99075

Also I see warning that browser has blocked parts of the page which are not delivered trough secure connection.

See the attached video how to reproduce this issue. It is not normal workflow as typically this happens if following links from email notification or from google results. It happens only for some pages.

Click here to play this video