wbgetentities uses the XML tag "property", while in the output of operations that change entities, it's "claim" and "claims". There may be structural differences too (grouping by property), I havn't checked that.
Version: unspecified
Severity: normal
Whiteboard: json, u=dev c=backend p=0
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=54313
https://bugzilla.wikimedia.org/show_bug.cgi?id=43025