I have enchanted maybe 30 diamond boots at level 30 and never saw feather falling. This seems to be the same issue as MC-130420 , but it has been marked as resolved
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Does this seem like the probability will change? It was a LOT easier just to do level 1-2 enchants and combine 4 pairs of boots. Luckily I was using villagers, but I sure wouldnt want to mine 16 diamonds for feather falling.
The developer comment on MC-130420 "reveals" the issue: When trying to go for Feather Falling, it is better to enchant at a lower level (26 to be exact).
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I was able to get feather falling, but it took nearly two inventories full of attempts between each one (4/129). Projectile protection even more rare, only 2/129, compared to 41/129 with fire protection, 10/129 with blast protection, and 62/129 with protection. 82 had unbreaking, and 55 had depth strider.