I did not realize this was a thing until I just switched to AZERTY which… despite being marketed as being “similar” to QWERTY, is still tripping me up
Edit: since this came up twice: I’m switching since I’m relocating to the French-speaking part of the world & I just happened to want to learn the language/culture, so yeah
I switched to Colemak-dh about 2 year ago when I bought a ZSA Moonlander after getting a terrible case of rsi in my left wrist. When I type on other keyboards (which I try to avoid whenever possible) I still use qwerty. Curious thing, I write at about 70 wpm with 99% accuracy with colemak-dh on my Moonlander but I can’t pass 10 wps when using colemak-dh on other keyboards, and I have no hope in hell writing with qwerty on the Moonlander at all. The motor memory is completely decoupled between the split keyboard and the non-split keyboard. Which I guess is good, since then when using someone else’s keyboard I won’t have issues using their keyboard.
What you just described is pretty much exactly my experience with colemak and split keebs too.
When i was learning colemak i decided to take the time to teach myself proper touch typing at the same time. Now i can only touch type colemak on a split ortho. I cant type qwerty at all on it.