Why does airspeed change when I adjust the prop?

Peter Dohm writes:

Actually, I am impressed that MSFS simulates this part of an airplane's
opereation. I would have though that it was beyond the scope of typical
training useage in a PC based simulator. I have no idea how accurate it
might be, but I do give them credit for including it.

Note that I'm using an add-on aircraft (Dreamfleet's Baron 58
simulation), which is vastly more authentic than the default
simulation. I don't know how much of the engine behavior is simulated
by MSFS, and how much is simulated specifically by this add-on. The
latter is renowned for its meticulous dedication to accuracy, though.

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