Here is a codepen that show how a select with multiple optgroup elements is unable to select some of the children.
Is this a bug ?
It appears you have some data errors. I can select most child items, and those I can’t select have issues in their data objects:
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{id:"one",text:"Switches & Relays"}: this item has the same “id” value as another item in the Select2 (the “first” item,select2_ary.push({id: "one", text: "one"}). Item IDs must be unique within the Select2. - All the other unselectable child items are missing either their “text” or “id” properties. Both of these properties are required.
Thanks very much. Just discovered this myself, apologies for bad post. Thanks Again
Updated codepen with good data