When creating a loot table in a data pack that uses the function minecraft:set_attributes, the custom attributes are added to the item in addition to the default vanilla attributes. This is different to how it functioned before in 1.20.4 where the custom attributes would replace the default ones.

Reproduction steps:
Load the provided data pack with the loot table in a new world.

/datapack enable "file/set_attribute_bug_demo"

Then run the command.
/loot give @s loot minecraft:diamond_sword

What should happen:
You get a sword with only +14 attack damage.
What actually happens:
You get a sword with +14 attack damage with the default modifiers still present.