Autocomplete in the debug console fails to work past the top level

A large way that I’ve been able to explore javascript objects is by checking the autocomplete drop-down menus and seeing what properties and methods are available. In UXP Developer Tool, in the debug console, I am unable to get autocomplete menus working past app.[dropdown here]
Any layer below that, such as app.activeDocument.[???] displays no autocomplete menu, so what I have to do is type in app.activeDocument, press enter, then expand the tree manually and use my best guess for every layer below the top level, which makes this process extremely tedious. I’ve been unable to find out why this is the case, or how I can fix it. I’m on an M1 Macbook.