I've heard of it being done on go-arounds where workloads high, and the PNF misses the positive climb call, if you don't get the trigger then it's very easy to miss the item completely.
What with desperately trying not to overspeed flaps, monitoring speed/rate of climb/missed app procedure/radio's etc your brain might not register the extra noise I guess.
That being said to reach FL230 and not notice?! I know on my type you certainly wouldn't get the acceleration you'd be expecting, even in the initial climb, with the gear down so you'd start looking around for the cause..
Zetec2 from my experience most civi commercial aircraft have pins fitted but they're normally only put in place when the aircrafts in the hangar or being towed.