Undeletable event dispatcher after changing its "variable type"

In order to reproduce it:

  1. In some actor blueprint, create a new event dispatcher. Let’s call it “MyDispatcher”.

  2. In the details panel, change its variable type (which is currently multicast delegate) to something else, a boolean for instance. Don’t ask me why doing that. The dispatcher becomes a variable now.

  3. Delete the variable “MyDispatcher”.

Now the compiler starts complaining “No delegate property found for MyDispatcher”, and I couldn’t find any way to actually remove MyDispatcher from the blueprint. This may be related to the following issue:

I’m using version 4.20.

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Thanks