Have you been able to figure this out?
I'm afraid I'm facing a similar issue now and it's driving me nuts.
My breadcrumb also only shows Home >> Current Page title instead of the full path.
The site has easy_breadcrumb enabled and runs with a custom theme.
I tried every other theme, I have installed, but the result is the same. So, templates can be ruled out since I don't remember changing anything outside of the theme folders.
The weird thing is, when the admin area and the frontend have the same theme, the full breadcrumb path is shown in the admin area while the frontend still shows the crippled version.
Installing pathauto didn't change anything neither did uninstalling and removing all contributed modules.
Thank you for your reply!
I'm using the standard language switcher for Drupal with no modificatons at all.
The block's name is " Language switcher (Content)".
Unfortunately there are no errors shown in the console, if you were referring to the one in dev tools.