Contradiction with Daniel 2:47
Daniel 8:1 describes Daniel receiving a vision in the third year of King Belshazzar, while Daniel 2:47 highlights a different context and time where Daniel is being honored by King Nebuchadnezzar for interpreting a dream, which doesn't involve visions or timings described in Daniel 8:1.
Daniel 2:47: The king answered unto Daniel, and said, Of a truth [it is], that your God [is] a God of gods, and a Lord of kings, and a revealer of secrets, seeing thou couldest reveal this secret.