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P3D v4 APU_STARTER has no effect

Hi there,

Long time lurker, first time poster. I've got a bit of experience in FS/P3D dev, but this one has left me stumped, so I thought here was a good place to ask :)

I've got an addon aircraft (Dino/IFE's Typhoon) in P3D v4 where an APU switch calls K:APU_STARTER behind the scenes, but the simvar APU PCT RPM never rises (nor does the starter), and it never provides any AC power at all.
I tried binding the actual APU STARTER event directly to a hardware button to rule out an issue in the switch logic itself, I even added the undocumented Auxiliary Power Unit to the aircraft.cfg (even though it should not matter as it's a jet anyway), to no avail. It's like the starter never kicks in or the APU does not exist, for whatever reason, and since there is no detailed documentation on the APU itself other than it exists and should work, I'm at a loss.
If all else fails, the next best thing will be to use the GPU logic instead, but I'm genuinely curious as to why the default APU system does not work at all. I've got a hunch it's not a problem with the addon but something more general, and I'm not sure where to look for it.

Thanks in advance for your input!