Commits on Dec 3, 2021

1. [6.0.2] Detach join entity when removing added relationship …

   Fixes #26779
   
   **Description**
   
   When a many-to-many relationship is created and then removed, the state of the join entity that represents this relationship is incorrectly changed to `Deleted`. This results in an attempt to delete a row in the database that does not exist.
   
   **Customer impact**
   
   Exception thrown when calling SaveChanges after adding and then removing a new many-to-many relationships.
   
   This is a fairly fundamental error. What is not clear is why this was not reported before now, since the behavior existed in 5.0. It's possible people didn't realize it was a bug and having been manually detaching the join entity to make this scenario work.
   
   **How found**
   
   Customer reported on 6.0.
   
   **Regression**
   
   This is not a regression; the same behavior existing in 5.0. However, we believe that it is a fundamental behavior that should work, hence we believe we should patch in 6.0.
   
   **Testing**
   
   Added a range of new tests for this and related scenarios with different types of many-to-many relationships.
   
   **Risk**
   
   Low; the change is very simple, and is also quirked.

   

   ajcvickers committed Dec 3, 2021
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