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Created a Registry Rule to Prompt on path *\bar\* Attempts to add keys result in unexpected behavior.
Created a new key "bar" - this prompts. Allow the create.
Under "bar", create a new key called "aa" and block the create.
You now see a key named "New Key #1"
Now try to delete the key named "New Key #1"
Popup: Error while deleting key.
You now have two keys: "aa" and "New Key #1"
This is a limitation or the registry filter capabilities as provided by Microsoft.