Why does InputMap.get_action_list() return nothing for an action with Joy Axis bindings

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My Input Map
var axis_ev = InputMap.get_action_list("move_forward_axis")
print(axis_ev)
Why is there no output for line 2 of the above code?
Using InputMap.get_action_list("move_forward_axis).get_class() causes an error because of this. I'm just trying to read out the current InputMap actions to a keybindings settings menu. I'm just asking about this here before I take it to Github. Maybe I missed something in @GDScript or @GlobalScope? I'm currently implementing a workaround that just knows about this hitch and acts accordingly, but I'd like to clean the code up in the future. I would say that InputEventMouseMotion has a similar issue, but the problem there was that there's no way to assign relative mouse motions to the InputMap outside of code afaik.

Godot version 3.5
in Engine by (12 points)

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