Child Vocabularies aggregates results not shown

1. Create Vocab A = [A,B]
2. Create a Child Vocab B = [AA, BA]  inherited from Vocab A
3. Create a page provider with aggregates on Vocab A & Vocab B
4. Create a file with Vocabs in its schema, and Vocab B values
5. A search will show the result in aggregationResults.png with no results displayed for Vocab B field.

It seems the data are returned but not interpreted correctly.

Workaround: None