Copying a socket to another skeleton adds a "_0" suffix

Copying a socket to another skeleton adds a "_0" suffix

Occurs on?
4.15 - 3450819 - YES
4.16 - 3466753 - YES
4.17 - CL#3512142 - YES

1. Create a blank project
2. Import the two attached FBX's (create a new skeleton for each)
3. Create a socket on one skeleton (any bone) and name it "TestSocket"
4. Right click the socket and select "Copy Selected Sockets"
5. Open the other skeleton
6. Right click any bone and choose "Paste Sockets"

Result: "TestSocket_0" is created even though there is not "TestSocket" on the second skeleton
Expected: Pasted as "TestSocket"