You'll notice
Useful2 Signal2
A plugin that only half-converts during install fails instead of caching a broken copy.
What's wrong with this entry?
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What
Copying a plugin's files into a symlink-free form now fails loudly when some entries could not be converted or the destination is read-only, instead of caching a half-converted tree that would be reused later.
Evidence
plugin tree could not be made symlink-free
Strings lifted out of the shipped bundle, so the claim above can be checked against them.