So, there are some resources from the Jetbrains people, but the page that correctly explained this part was just that .
You must specify the fully qualified class name that you need for debugging. Perhaps this does not match the registrar's registered name for this class. For example, if you use com.intellij.openapi.diagnostic.Logger , then # will be added before it in full name, for example, for the class com.example.MyClass you will be #com.example.MyClass .
I checked the thing and it works. Remember that if you use the IntelliJ sandbox to test your own plugin, then you must set up the debug configuration in the working sandbox, and not in the IDE that you use for development purposes.
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