Bridge bastion generates quartz blocks inside one basalt pillar

The Bug

The Bridge bastion always generates with 4 Quartz Blocks and 2 Smooth Quartz Blocks inside one out of two basalt pillars.
This quartz generates only in this type of bastion and nowhere else, which seems very out of place.

 

How to Reproduce

• Use the following command to place a template structure

  /place template minecraft:bastion/bridge/bridge_pieces/bridge
  

• Observe that one pillar has 4 regular quartz and 2 smooth quartz blocks