The Bug:
Lava within basalt deltas biomes doesn't update correctly when intersecting nether fortresses.
Here is an example:
Version: 1.21.4
Seed: -2178309719778189280
Coordinates: /execute in minecraft:the_nether run tp @s 109525.65 56.89 -227.80 -717.34 -29.81
Steps to Reproduce:
Generate a world with the seed provided above and teleport to the given coordinates.
Look at the generation of lava and how it intersects with the nether fortress.
Take note as to whether or not lava within basalt deltas biomes doesn't update correctly when intersecting nether fortresses.
Observed Behavior:
Lava within basalt deltas biomes doesn't update correctly.
Expected Behavior:
Lava within basalt deltas biomes would update correctly.
Related issues
is duplicated by
Attachments
Comments

Could you please provide seed and coordinates?

Reporter, please give coordinates and seed

I've found an instance of this myself.

Suggested fix (please add to main text): when generating bridge structures, if the fortress detects any non-air blocks bordering the 3x3 tunnel of air that generates as part of the bridges, these adjacent blocks should be replaced with nether bricks. This fixes this bug along with softening the ugly and awkward netherrack roofs you tend to get with fortresses.

Confirmed for 20w30a.
Can confirm in 20w51a.
Can confirm in 1.16.5 and 21w18a.

Can confirm in 1.17.1.
Can confirm in 1.18.2 and 22w16b. Relates to MC-231712.
Version: 1.18.2
Seed: -6901966002481662265
Coordinates: /execute in minecraft:the_nether run tp @s 28801.46 60.00 -1055.21 -1073.09 -9.68
[media]Can confirm in 1.19.
Can confirm in 1.19.2.
Version: 1.19.2
Seed: -2178309719778189280
Coordinates: /execute in minecraft:the_nether run tp @s 109525.65 56.89 -227.80 -717.34 -29.81

i have found this as well, reported it and l then i was lead here
i will post seed and cords later today

Can confirm in 23w03a
Seed: 8587948038190963789
XYZ: -1235 67 4998
World type: Default
Image:

In 23w43b

In 1.20.4 and 24w05b