Not sure if anyone will read this comment, but just in case it helps someone out with this model (or other macbooks with the new butterfly keys).
These keyboards are notorious for experiencing issues with the keys sticking down or becoming irregularly responsive. People usually presume correctly that they’ve gotten some dust under the keys.
I believe there is an alternative explanation as well: the key caps are so thin that over time they actually warp, causing the outer edges of the keys to scrape the sides of the key wells leading to poor responsiveness.
If you’ve already blown the dust out and cleaned underneath the key with isopropyl alcohol after removing the cap, try to gently flatten the key and its edges back to right angles before re-installing it in the mac. I had to ‘clean’ under my “I” key about 5 times before I noticed that the key HAD actually warped. A few very gentle bends of the key with my fingers, and no more double-typing!!
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