Gilded Blackstone doesn't give the fast flat attribute to a Sulfur cube

The Bug

Gilded Blackstone doesn’t give the fast flat attribute despite being a gold block/ore

Reproduce

• Place Gilded Blackstone in a Sulfur Cube

• Hit it

• Place a gold block like Nether Gold Ore in a Sulfur Cube

• Hit it

Observed Result

They had different attributes

Expected Result

The Gilded Blackstone would give the same attribute as the gold block since they both are gold like blocks