Now a very popular new fan theory argues that during his time travels, Captain America switched Mjölnir with a fake, so the real one survived.
Reddit user The Mediocre Critic wrote: “So for Jane Foster to claim the hammer and get the power of Thor, I believe the hammer has to survive. But how?
“So I think I have the answer. Cap goes back to the events of Thor Ragnarok and makes a quick switch.
“Perhaps at Dr Strange’s mansion, he secretly gives Thor the replica, and that’s the hammer Hela shatterers.”