I've done an upgrade from Moodle 3.10.3 to 4.1.3 and the breadcrumbs for the classic theme has been behaving strangely.

When you're logged in as a user - the user profile, grades and preferences pages have breadcrumb issues.
User profile page has no breadcrumbs.

Grades and Preferences have duplications of the home page.

This was working on 3.10.3. The breadcrumbs for our courses seems to be okay.
Any ideas on how to fix this?
Cheers,
Oliver


