You'll notice
Useful2 Signal1
Memory failures now say invalid_path or not_writable in plain words instead of an HTTP status.
What's wrong with this entry?
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What
A memory operation that fails because of a bad path or a store you cannot write to now reports invalid_path or not_writable in plain words, instead of the generic HTTP status text. The path-prefix hint that says where a store's memories live is now omitted for stores that have no prefix.
Evidence
the store is read-only in this session
Strings lifted out of the shipped bundle, so the claim above can be checked against them.