[BUG] Model editor can't duplicate dummies properly

[necriot]

Describe the bug
when i try to duplicate dummies in the model editor the initial one is still selected, once i move the initial one and try to select the duplicate - it re-selects the initial dummy that i had attempted to duplicate. the same thing happens if i duplicate it and then select the duplicate from the left menu in the dropdown part called "Dummy".

also - when i save and reload the model, there are no duplicate dummies at all, only the initial one appears, wherever it was moved to or where it was at first if not moved at all.

To Reproduce
Steps to reproduce the behavior:

1. Go to "model editor"
2. Click on - for example c2570 from dark souls remastered
3. Click on "dummy" dropdown and then the one named the same thing underneath that
   4: right click any dummy and press "duplicate"
   5: move the duplicated dummy
   6: try to select the other dummy that is identical to the one you've duplicated
   7: save, and reload
   8: visible results should happen here

Screenshots
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Please include a screenshot of the full exception message in the case of a crash.

Additional context
this happened while i was trying to edit the dummy stuffs of a unique instance of a berenike knight i created and edited the animations for.