Dust has nothing to do with the Butterfly keyboards issues with jamming. It's susceptible to debris and specifically very hard debris, but not dust. You'd need a pretty impressive pile of dust before you can impede the action of a butterfly mechanism.
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That's the inside of a butterfly switch key from a 2016 MBP I had. The switch itself is sealed. It's actually an ordinary rubber dome switch that's similar to what you find in a scissor keyboard. Dust is not getting in there. It's sealed. That leaves the stabilizer, which is the butterfly. There are specific points in which solid debris can cause the levers to get blocked, but it's a pretty hard mechanism. Dust alone is not going to stop it from moving.
If you don't have hard chunks of debris that somehow managed to get under the keycap, then either something is causing the butterfly mechanism to deform so that it fails to collapse or the keycap is misaligned.
Try giving the key a firm press. Hold it down and wiggle it clockwise. Then repeat counterclockwise. If it's soft debris, doing this a few times should crush whatever it is. If it's an alignment issue, it might be able to realign the keycap.
If this doesn't work after a few tries, return it and get a new one. They won't all do this and it's possible that some get better with breaking in. The 2016 that I had would get stuck every month or two the first year I owned it, but was completely trouble free afterwards.
BTW, don't pry the keycaps up. If it lifts up when you gently try to lift it, then the keybinding between the keycap and the butterfly is broken and the keycap should be replaced. If you have one corner or side that appears to be sunken in and it's truly because the butterfly jammed, it's better to just give a firm press to try and get it to bounce back up. Prying it back up via the keycap is likely to damage it.
