The Bug:

Lava deltas can intersect bastions.

Here is an example:

Seed: -2853169021812492922
Coordinates: /execute in minecraft:the_nether run tp @s -10065.57 87.04 -9953.16 -123.23 49.91

Steps to Reproduce:

1. Generate a world with the seed provided above and teleport to the given coordinates.
2. Look closely at the generation of the lava deltas.
3. Take note as to whether or not lava deltas can intersect bastions.

Observed Behavior:

Lava deltas can intersect bastions.

Expected Behavior:

Lava deltas would not be able to intersect bastions.