Wrong airspeed in X-plane HIL

Prompted by Larry Grater, I investigated the airspeed that APM Mission Planner is pulling in from X-plane and handing to APM.

It appears that It is confusing X-plane's TAS with IAS.  Seeing that APM will only know airspeed as indicated airspeed from a pitot-static system, it makes sense to me that the airspeed reported to APM should be indicated, not true.

Have I got this all wrong?

Does APM actually use the airspeed from X-plane?  When I look at the configuration for my HIL firmware version, it already has the airspeed sensor selection ticked, so presumably this is supposed to be being simulated with data from X-plane

I've just installed the latest 1.1.36 to check if this error still exists and it appears so.

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