Why did Jewish leaders change their mind on the arrest and execution of Jesus?

We read in Mtt 26:3-5(NIV); > Then the chief priests and the elders of the people assembles in the palace of the high priest, whose name was Caiaphas, and they schemed to arrest Jesus secretly and kill him. “But not during the festival,” they said, “or there may be a riot among the people.” < But we see Jesus getting arrested on a day of Passover and getting crucified on the Day of Preparation ( Jn 19:14) Apparently, the Jewish leaders had a change of mind vis- a- vis their original apprehension in Mtt 26: 5. The Gospels do not record the reason for the shift. Are there any apocryphal writings on the subject ?