Dynamo version
1.3.2
Operating system
Win 10
What did you do?
Removed all inputs from the String.Join node using the +/- UI node buttons. Added them back to the node using the + button
What did you expect to see?

What did you see instead?

So the output is correct, but the name of the input is lost. I would expect the node to be developed such that the minus button deactivates once the last string input is remove (so only the 'separator' input remains).
cc @mjkkirschner