FWIW, these are called 'sample breaks' and they've been around since instruments started using PCM samples. Some of the very first instruments had just monophonic samples, with maybe 3 samples across the keyboard. So a trumpet that sounded fine an octave above Middle C would play at half speed at Middle C and 'burp'! Memory was ferociously expensive back then, of course.
Things rapidly improved and the 'norm' became one sample covering three or four notes. All makes worked hard to disguise the sample breaks but you could still hear them. In fact, you still can, regardless of the instrument or where it sits in the range. I can hear them on my Roland Atelier organ, and that was a £25,000 instrument when new. Some breaks will be more obvious than others and where you go outside of an instrument's true range, it's common not to use any new samples, so you still get the speeding up / slowing down effect. It is possible to blend from one to another but it's tricky and no doubt costly to do.
It's one of the prime reasons that, back in the late 1970s, when Kawai were working on their first digital instruments, we decided against using samples for anything except drums. We'd sample, of course, but then use powerful computer analysis and create the sounds using real time additive synthesis. It was great 'fun' pointing out the advantage we then had - no sample breaks. We could ask a customer to play up and down an octave of a given sound and listen to our instruments versus rivals! When sampling 'came of age', we eventually switched.
If you want one sample (or multiple samples) per note on a piano, you probably have to go virtual. One of the virtual grand pianos on this PC is 11GB, and that's not a recent one. The start of each note is loaded into RAM and then the rest is streamed from disk. Same with virtual pipe organs.
There are some instruments with one/multiple samples per note, Allen organs, for example. Wersi and Bohm organs, being computer based (Windows in the case of Wersi) may well have this, but I haven't tried one in some time.