Unable to access translated node content

After performing a Drupal core update on my site today I’ve found that I can no longer access translated content. When I try to view or edit the translation, I only see the default language content.

I created a short GIF you can view here:

via GIPHY

As you can see, I’m editing the node for Canada and the US translation is showing instead. Translations were working fine with Drupal 8.6.2 but began to do this in 8.6.3. I have now done the following with no success:

  • Updated to the latest Drupal core 8.7.2
  • Updated all installed modules
  • Created a new Drupal site with 8.6.3 and 8.7.2, but this issue does not exist
  • Disabled Workbench moderation for a given content type, but that doesn’t fix the issue

I’m really not sure where and or how to troubleshoot this issue. Where would you start?

I’m thinking I could start by uninstalling modules to see which is possibly causing the issues. I’m not sure if that is the right approach given that this issue began when I updated the Drupal core, not the modules.

Thank you for any feedback!