Thirteen and Twilight director Catherine Hardwicke was also famously fired from the franchise before Twilight: New Moon went into production.
Besides the Summit Entertainment movies were kind of known for firing people, including sending out a scathing response when the studio opted to replace Rachelle Lefevre with Bryce Dallas Howard.
Early on, if Summit had wanted to fire Pattinson, it totally could have happened.
It’s honestly not too astonishing to hear there was at least some talk that Robert Pattinson could be fired for set antics, especially since this story comes from a time before Twilight became a brand and before Pattinson became a household name.