Godot GDScript language - code tab characters are not being displayed

Hi,

I am having an issue with the code styling in which the tab characters, when using GDScript, are not being displayed, resulting in really hard to read code.
When I go to Options -> Editor -> Code Style -> GDScript, in the code example, tab characters are displayed (Use tab character is enabled), but I do not see them in my code.

Anyone knows what could be happening?