Hanging Roots generate under mineshafts instead of the ceiling

The Bug

As you can see in the image the roots generate in the planks. In the ceiling there are no roots.

Reproduce

Seed: 9098444692520878126
Coordinates: /execute in minecraft:overworld run tp @s -1991.30 -1.45 1957.21 318.30 -65.10

Observed Result

The hanging roots generated under the mineshaft instead of the rooted dirt/moss above

Expected Result

The hanging roots would generate on the ceiling