Barely Default Data Pack v2.12 (MC 1.21.7-1.21.8)

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You can now climb chains like ladders and vines
Shot spectral arrows emit a light level of 14 when grounded; when the arrow is picked back up or naturally despawns, the light source is removed. Spectral arrows underwater or when occupying the same space as transparent blocks do not emit light
Smoother armed armor stand function
Fixed copper butterfly variants losing some of their data during natural spawning
Fixed some missing predicates for fish caught in mushroom fields
Changed the stats of attack damage and attack speed for hoes
Changed the chain recipe to result in 2 chains instead of 1
Changed the iron nugget from smelting/blasting recipes to include cauldrons as an ingredient
Changed some loot tables