How can the grave be a garden from the gardens of Paradise or a pit from the pits of Hell, even though the body will decay and the soul will go wherever Allah wills?

The Barzakh life is an intermediate life between this world and the Hereafter. It begins from the moment a person's soul is seized and continues until the Hour is established. In it, the two angels question the servant, and the servant is either blessed or punished according to their deeds. This happens to everyone who dies, whether they are buried or not.