Jon, as commented elsewhere, that is a feature of the actual aircraft instrument and is intentionally present because is a source of fatal accidents.
An example: Imagine walking out the back door of your house, to your grass strip, get in the plane, start the engine, taxi 100ft to the end of the runway, take off, turn on the autopilot, enter the overcast, start calling ATC to confirm time-off for the IFR departure, get hit by a gust, see a pitch/roll upset, the autopilot corrects it for you, die (unexpectedly).
It's interesting to note that the newer STEC autopilots run off the electric turn coordinator instead of AI, so they're much more reliable, and less likely to kill you after a vacuum failure.
All the best,
David
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