OptionalcontextExtra context (renderer type, scene layer URL, widget name, …).
OptionalexpressionThe offending Arcade expression text, when applicable.
OptionallayerOperational layer id, when the gap is attributable to a specific layer.
OptionalpathPath within the WebMap JSON (e.g. operationalLayers[2].popupInfo).
Human-readable explanation surfaced in reports / TODO annotations.
A single unsupported construct discovered while deriving the style.