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Hook-related log messages and internal naming have been updated from "Bash command" (LocalBashTask) to "Shell command" (LocalShellTask), reflecting the new multi-shell support. Messages like "Bash command failed for pattern" are now "Shell command failed for pattern."
Evidence
Terminology rename (search for "LocalShellTask" and "Shell command failed for pattern")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.