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This does not sound right at all to me. I am skeptical that this is proper behavior, and suspect there may have been something else going wrong or some other force at play here.
I say this because I regularly use the cruise control to keep myself from speeding on residential roads, and have never had any issue whatsoever accelerating to higher speeds when necessary. The main road off of my neighborhood features just such a transition, in fact. Speeds go from 25mph to 45mph, and I've accelerated up to the latter speed while the cruise is set at 27mph (adjusted from 25mph for speedometer error) with absolutely no issue at all. The car behaves exactly as if I had been holding my speed at 27mph myself using the accelerator pedal instead of the cruise control system doing it for me.
OP, have you attempted to reproduce this effect (without the scary truck coming at you from behind, obviously)?
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