That’s the problem I think. I’m not a Steam user of MSFS, so can only go by what I have read, but my understanding is that Steam only downloads the equivalent of what we download via the MS Store. That then downloads the rest of the sim. If you verify the Steam cache, it sees all those additional downloaded files, and deletes them, resetting it back to the state of that initial install, so you have to download it all over again.
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