You'll notice
Useful2 Signal1
macOS /net autofs paths are now treated as network paths, so previews are skipped and attaching one is refused.
What's wrong with this entry?
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What
Paths under /net/<host>/..., the macOS autofs -hosts mounts, are now recognised everywhere UNC network paths already were. File-read, write and edit previews, notebook reads, file opening and sed target checks all skip content previews for them, and attaching such a file is refused with a message saying it is a /net autofs path.
Evidence
is a /net autofs -hosts path, which is not supported.
Strings lifted out of the shipped bundle, so the claim above can be checked against them.