Fortresses don't spawn in basalt deltas

Relates to MC-171017. Might be a duplicate, unless a bug report that implies MC-171017 intentional is different.

I somehow did manage to randomly get a fortress to (almost) generate in the basalt deltas biome in a default world type. I'll attach a screenshot of it.

Seed: 7455379112007348001

Coordinates:

/execute in minecraft:the_nether run tp @s 28.88 54.00 27.70 -39.15 4.95

Basalt Deltas, along with Crimson and Warped Forests, lack the following line of code:

this.addStructureStart(Feature.NETHER_BRIDGE.configured(FeatureConfiguration.NONE));

I'd say this is a duplicate as MC-171017 occurs for the same reason.

Fixed in 20w16a. I saw a fortress completely in a basalt delta naturally. I also reproduced the issue and the basalt delta buffet world now spawns fortresses.