Re-Importing a Static Mesh Removes All Sockets

Re-importing a static mesh results in all currently applied sockets being removed from the static mesh in the Editor.

Workaround: Setting the sockets up in the Native 3D editing software following the naming convention: SOCKET_[name] will allow the user to make changes and reimport sockets multiple times.

Regression: Yes, works in UE4.13 but not UE4.14 on

1. Open a Blank Blueprint Template project with Starter Content
2. Open to default map (two chairs and a table)
3. Add Sockets to the static mesh "SM_Chair"
4. Export "SM_Chair" to desktop
5. Re-import "SM_Chair"
   RESULT: Sockets previously added to chair will be removed
   EXPECTED: Sockets to still be applied to reimported static mesh

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