Documentation and behaviour don’t match. IMHO you have stumbled upon a bug (or documentation error …), see JSONPATH is no JSONPATH anymore. · Issue #5132 · eclipse-archived/smarthome · GitHub .
Edit:
Workaround would be to use jq
(or a similar tool) and Exec binding, see JSON transform problem in OH 2.3 - #3 by job .
Edit #2:
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