HasValue1 returns false for ItemList of ListItems about schema.net HOT 2 OPEN

It is technically behaving as intended though the intended behaviour isn't fantastic. Basically the ValueJsonConverter performs a "right-to-left" type check for any objects it tries to deserialize. The types for itemListElement are ListItem, Text or Thing from "left-to-right". This ordering is just from how we get the data in the schema.json files we process.

Because everything implements IThing, it succeeds with deserializing and doesn't try other types. What we could do is alter the logic to try a different algorithm for best fit - something that demotes Thing to the last possible choice.

It might seem somewhat obvious in this example that we could just switch from "right-to-left" to "left-to-right" however we'd need to confirm we aren't just creating the same problem for other schema properties.

from schema.net.

Thanks for looking into it @Turnerj That makes sense.
A workaround I used was just to check if the current item "is" an IListItem, if HasValue3 returns true.

if (itemList.ItemListElement.HasValue3)
{
	foreach (var listItem in itemList.ItemListElement.Value3)
	{
		if (listItem is IListItem)
		{
			// do something with list item
		}
	}
}

from schema.net.