I have a multi node tree picker (Umbraco.MultiNodeTreePicker2) data type that contains the xpath filter $root/settings/testimonials. This works correctly when I use the data type directly on a document type and when selected will direct you to the correct folder of the required content.

However, when this data type is used in the grid editor, the filtering no longer works and the entire tree structure is displayed.

Is this a bug or am I missing something?