Overriding a UFUNCTION in a Blueprint results in an empty "Event Graph" category being shown in a Data Asset containing an instance of the Blueprint

When looking at the details of a UObject contained in a Data Asset, some categories are shown even though they should not be. If a category is marked as hidden in the parent class, it will be shown in the Data Asset (though variables in that category will not be shown). In addition, if a UFUNCTION from the Blueprint's parent class has been overridden in the Blueprint, another empty category named "Event Graph" will be shown in the Details panel.

REGRESSION:
Yes. In 4.20.3, hidden categories and the "Event Graph" category are not shown in the Details panel.

1. Download the attached project (project created in Main at CL 4555827).
2. Associate the project with your version of Main.
3. Build the project in Visual Studio.
4. Open the project in the Editor.
5. Create a new Blueprint that derives from the MyObject class.
6. Create a new Integer variable in the Blueprint. Leave the variable's category set to Default.
7. Create a new Bool variable. Set the variable's category to "DoNotShow" (this is a hidden category in the MyObject class).
8. Override the Receive Event Triggered function.
9. Compile, save, and close the Blueprint.
10. Create and open a new Data Asset that derives from MyDataAsset.
11. Add an element to the InstancedUObjects array.
12. Set the new element to the Blueprint created in step 5.
13. Expand all of the categories in the details for the first element of the InstancedUObjects array.

RESULT:
The "Do Not Show" category is shown (but the variable in the category is not), and there is another category present named Event Graph.

EXPECTED:
Only the Default category is shown since the other categories are empty (as far as the Details panel is concerned).