According to Osho, when thoughts fall silent, bliss arises as the recognition of your true nature: unbreakable, untouched by gain or loss. What can break (the hand, the body, possessions) was never truly you and is already passing; what is truly yours cannot break. Therefore, whether a hand heals or not is spiritually irrelevant to bliss.
Quiet your mind and you see the real you can’t be hurt, so a hand healing or not doesn’t decide your happiness.