As suggested in the title of the report, when a dependency is destroyed, the name should become reusable again (unique name in the Fully Qualified space).
A bug in the Unregister Subsystem VI does not delete the name from the dictionary.
Probe 15 shows that the object's name is used instead of its qualified name to find and remove from the dictionary of FQNs.
francois-normandin
commented
2 years ago 
Thanks @gcodetechnology for the bug report.
As suggested in the title of the report, when a dependency is destroyed, the name should become reusable again (unique name in the Fully Qualified space).
A bug in the Unregister Subsystem VI does not delete the name from the dictionary. Probe 15 shows that the object's name is used instead of its qualified name to find and remove from the dictionary of FQNs.