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Identical cache key hits on ubuntu/mac, but misses on Windows

See original GitHub issue

In this run I have created a cached asset in the package step with the key package-5fc9dd41a6ade85100c424bab5b08d65d79922d1:

Run actions/cache@v2
  with:
    path: build
    key: package-5fc9dd41a6ade85100c424bab5b08d65d79922d1
Cache not found for input keys: package-5fc9dd41a6ade85100c424bab5b08d65d79922d1

Post job cleanup.
/bin/tar --use-compress-program zstd -T0 -cf cache.tzst -P -C /home/runner/work/conda-pack/conda-pack --files-from manifest.txt
Cache saved successfully

All of the MacOS and Linux variants in my tests job successfuly find the cache; e.g. this one:

Run actions/cache@v2
  with:
    path: build
    key: package-5fc9dd41a6ade85100c424bab5b08d65d79922d1
Cache Size: ~0 MB (41307 B)
/bin/tar --use-compress-program zstd -d -xf /home/runner/work/_temp/51c1d57a-7530-487c-95ad-4a7fcb4d58cb/cache.tzst -P -C /home/runner/work/conda-pack/conda-pack
Cache restored from key: package-5fc9dd41a6ade85100c424bab5b08d65d79922d1

None of the Windows variants do; e.g., this one:

Run actions/cache@v2
  with:
    path: build
    key: package-5fc9dd41a6ade85100c424bab5b08d65d79922d1
Cache not found for input keys: package-5fc9dd41a6ade85100c424bab5b08d65d79922d1

Remember, these are all parallel runs of exactly the same build step. Will try to post some debugging information when I can figure out how to do it.