I just found a rather... strange... looking structure generation, and just wanted to know if this kind of thing could be prevented.

Just looks odd. Not really any kind of issue.

Maybe check for less than a certain percent of air blocks for some structures?

You mean like this?

Block: 14 120 680
Chunk: 14 8 8
Facing South
Seed = 6671477354648227245

Installed mods that add biomes: Plants, Rockhounding: Surface, and Traverse.

That's exactly what I saw.

That's... interesting. I do have a system in place that should make sure this doesn't happen. Can you send me the world and coordinates of the cliff to check myself?

A bug in another mod corrupted the world, actually. I'll try and find something similar in another world.