I have some taxonomy_advanced fields displayed in a frontend submission form. One of them is a select_advanced field handling a hierarchical two level taxonomy. The others are checkbox_list type fields.
I'm trying to set selected/checked options on form load using the rwmb_field_meta filter with a callback function that returns a coma separated list of some of the term IDs for the taxonomy (e.g. a string like '10,20,30').
However, only the first ID in the list is set both on the select_advanced and the checkbox_list fields types. What would be the right way to do this?
I'm using Frontend Submission and Custom Table extensions. Data saving is working fine in all cases.