You'll notice
Useful2 Signal2
Copying a plugin into cache aborts if files are swapped out mid-copy.
What's wrong with this entry?
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What
Copying a plugin into the cache now opens files without following symlinks where the platform allows it, and re-checks during the walk that directories are still directories and files still regular files. If something is swapped mid-copy the copy aborts with an explicit error instead of following the new path.
Evidence
plugin copy source swapped for a non-regular file mid-copy
Strings lifted out of the shipped bundle, so the claim above can be checked against them.