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Now that you've mentioned they might be canyons and not tendrils, I'm pretty sure that's what's going on - although when I think 'canyons' I think expanded ravines, whereas the emerald ores in my dimension look more like fallen tendrils. In any case, here are some screenshots for reference...

So I created a dimension with the special Peaceful dimlet, which seemed to work fine at first (no hostile mobs anywhere), but then I found a nether fortress with active blaze spawners. I'm guessing peaceful doesn't apply to spawners? Also, can someone confirm if it's possible to specify...