When an NiagaraParameterCollection asset is duplicated or when its namespace is changed, any existing parameters get incorrectly duplicated/renamed with the addition of the namespace prefix

When an NPC asset is duplicated, the ne wasset gets incorrectly duplicated parameters: one set with the correct names, and one set with the original namespace prefix embedded into the names. These incorrectly-named duplicate parameters cannot be deleted, unless they first go through a rename operation (in which the name can even be left unchanged).
Also, if the namespace of an NPC asset is changed after it already contains some parameters, those existing parameters get incorrectly renamed to include the previous namespace prefix.

1. Create a Niagara Parameter Collection (NPC)
2. Add some parameters
3. Duplicate the NPC asset in the Content Browser
4. Open the duplicate and note that the parameters are doubled, with one set containing the namespace prefix.
5. Also note that these prefixed parameters cannot be deleted. Click on each of their names to start renaming them, and confirm the rename with or without changes. Deletion now works.
6. Go back to the original NPC and rename its namespace
7. Note that all of the existing parameters got renamed to include the original namespace prefix.