Nested Structs don't work in the details panel

Nested structs do not expand in the details panel whenever opening it in the full Blueprint Editor.

Tested in 4.20.3 (CL - 4369336), 4.21.2 (CL - 4753647), 4.22.1 (CL - 6063286), 4.23 (CL - 6684273)

1. Download the attached project
2. Open the TestActor_C_BP
3. Open Full Blueprint Editor
4. Select the TestComp
5. Expand the Hit Reactions until you get to the Type Map

Expected: The Standard attack type map should be expandable

Result: The option to expand is not present

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