DM1 and DM2 were created by splitting the original design member by DM3 and DM4. DM3 and DM4 were created by splitting the original design member by DM1 and DM2.
Structural Detailing creates only the split frame connections. This is an ambiguous case that you need to modify later in the design cycle with additional objects such as column or side plates, so logical connections are not created.
All assembly and physical connections are placed on the To Do List because there is no physical contact after trimming.
The following figure indicates the trim lines after detailing: