you were able to remove it completely? both ends?
Yes, both ends- it helps to have smaller hands. Remove the coolant reservoir, then unfasten the bracket which holds the MAP sensor, held on by a torx bolt. I was able to get the tube off of the exhaust manifold by gently pulling straight down in line with the nipple.
Reinstallation was a struggle. Warming up the tube to soften the rubber helped. Those with bigger hands might need to do some more disassembly.

That's really interesting and good evidence to help explain the problem. Please let us know how you find the engine runs on the road and if and when it stalls again in the manner we've been seeing. How old is your bike and how many miles on the odometer? What fuel have you been using?

Mine is a 2022 purchased in July of 2022 with just over 9000 miles on the odometer. I use regular 87 octane unleaded (E10). I've filled up with ethanol free a couple times but did not notice any change in character.
I will see how she behaves and report here if I notice any other changes.