Attacking Xtra Hero Cross Crusader with Avramax did not give the option to gain Crusader’s attack. I had used Crusadia Maxmius’s effect to double battle damage.
Bug reproduction steps
Use Crusadia Maximus on Avramax and attack a special summoned monster.
Screenshot OR error code
Avramax should have gained Cross Crusader’s attack (3000 -> 4600) and then done double damage (6000 instead of 2800).