The reference field is broken because the data cannot display there since it’s reference to fields from a different database… However, you can set the value in one of the field your referencing from.
You can access the Reference field " Field" >> {itemData.members.field key from reference field;}.
then you can use setFieldValue to set the Field you want. “little complicated but i hope you understand”
Following - I have the same issue too. It seems simple, but I just can´t figure out how to retrieve and insert the referenced item ID
I find a lot of explanations and code snippets, but actually, i need to see the whole page code to see what is going on