Is it really a problem ?
I don't use the official style manager (always been used to District Styles modded one), so I don't really know how it works, but it doesn't seem to prevent you from adding the assets to a style, eventhough it says "Legacy Asset".
Also Boformer's Disctrict Style mod works fine, if you don't mind using it.
I don't think I have the time right now to update all my assets so they are not Legacy Assets.

when I nry to add it to a style it is showing as a legacy asset, thats about all the content manager gave me on that.

@KittenCanaveral
Seems to be working fine to me.
Make sure the required prop is active in the content manager.
If it still doesn't work, could you give me more details about what's broken ?

This seems to no longer be working after the new DLC, could you update it?