Normally when a dynamic is selected and you Shift-D a new one it overwrites the old. Just notice that if you do the same operation, but now add a hairpin it adds the dynamic instead of overwriting. The overwriting behavior is good as obviously two simultaneous dynamics don’t make sense, but this is probably a small oversight.
- Shift-D f to enter forte
- With f selected, Shift-D and enter mp> (or any dynamic with a hairpin)
- Result is you get two stacked dynamics