When creating a record from N:N sub-grid, it automatically populates the Primary lookup for the relationship. Due to which the below issue occurs

1) The record gets populated in 1:N sub-grid.

2) The record is not reflected in N:N sub-grid.

In both the scenario, form is being called based on createFromEntity which results in the same network call to InitializeFrom.

This does not distinguish which relationship is being used to map and populate the resulting create form so, we get the same behavior.