It seems that enchantments on tools (I only tested it on netherite sword and axe, but I would assume it applies to other tools as well) are not staying when you go into 24w09a from a previous version. Armor, tridents, bows, crossbows, and even sticks seemed to work fine though.
MC-268841
Enchantments not upgrading
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I enchanted a Netherite sword with Sharpness in 1.20.4, closed the world, opened it in 24w09a, and it was still enchanted with Sharpness. Please attach a video of this happening.