Regarding the Beta.

Dragon Ball Super Future Trunks in Base, his Super doesn't work?

Am I using it wrong or is it bugged? Someone confirm please.

His super is a healing ability. It will work only if you got a teammate that have taken damage  😉

Are you sure? It didn't work.

Future Trunks (Super) Base form Super Move

You need to have at least one teammate, and he needs to have taken damages for the healing to work.
I just tested it, it works perfectly.