How exactly are you changing the name?
As a test on Xcode 11.3.1, I created an emitter, selected it and opened the attributes inspector. I changed the name of the emitter in the Name text field and pressed the Return key. The name change persisted after pressing the Return key. Pressing the Tab key after changing the name in the text field works as well.
I am doing the exact same thing with the exact same version of Xcode.
However, when I press enter or tab, the name is reset to empty.
This is super weird.