As explained in Devan-Kerman/Trident-Return#1, sorting/reordering the "Enchantments" ListTag causes an incompatiblity with Trident Return because an equality test of 2 ItemStacks fails (one clientside, one received from the serverside).

This also means that BEB technically changes the actual items - when playing in singleplayer at least.

There might be a fix for this where the original ListTag is left alone and only the tooltips are generated in a sorted order.