Mismatched entity and/or field definitions

I can reproduce the error. Additionally. I've also noticed that the translation option for the Site Settings entity is missing. This appears to be caused by the removal of the "canonical" route in this commit, related to this issue 📌 Remove the canonical route of the site setting entity type Active . Re-adding the line
"canonical" = "/admin/structure/site_setting_entity/{site_setting_entity}",
restores the translation functionality.

Thanks for getting to the bottom of it. So reverting this one? 📌 Remove the canonical route of the site setting entity type Active . It was the solution to a different issue though with the old flattened site settings loader, so would need to understand how to get a fix that covers both