Does the issue occur in the editor or during gameplay?
Visual Script Editor
If it's a gameplay issue, please specify which movement system and camera type you're using (free movement vs. grid movement, third-person vs. first-person) or N/A if not applicable:
N/A
Briefly describe the issue you're experiencing:
If you have more than one dialogue, the drop down box on the start dialogue node, if you select the top most dialogue, will actually set the bauxite to blank ("").
Upon looking at a similiar node (set dialogue), the dialogue drop down box has a (none) option at the top (which start_dialogue does not have [visually in the drop down list anyway]), but maybe the code for start dialogue is also assuming the top option is (none), similiar to set dialogue, but in start dialogue's case, the top option is a dialogue file, not (none).
Just a guess at what might be happening anyway.
Here's a GIF of the issue)

I can also confirm this happens across projects.
Are there any errors in the in-game debug console or external console window?
No
Provide the steps necessary to reproduce the issue:
- Add a start dialogue node to VS editor
- connect it to the Start Node
- have more than one dialogue
- change it to start a different dialogue
- now set it back to the top most dialogue option
- look at the bauxite code
(optional 7). take a look at set dalogue's dialogue option..the top most option makes sense if it's (none).