For Jesus to fulfill Scripture He had to be the PassoverLamb! This means that His death on the cross had to be at the time when the lambs were being killed for Passover. This would make “The Last Supper” His last supper and foundation for Easter and other Christian practices, not the Seder Meal of Passover!
John 19: 31 + 42, Luke 23: 54 – 56, Mark 15: 42, Matthew 27: 62 are verses after Jesus’ death and they refer to the Day of Preparation and a special Sabbath. This would mean that Passover had not occurred yet.
Does Jesus’ life need to be intertwined with Passover – Yes! Is Easter and Passover related – Yes! Can we learn from Passover customs and practices – we should! I feel that this article does a great job examining the issue – https://www.biblicalarchaeology.org/daily/people-cultures-in-the-bible/jesus-historical-jesus/was-jesus-last-supper-a-seder/ .
Okay, do not take up arms or keyboards! The important thing here is Jesus died on the cross and paid the price for our sin! Man’s traditions and religious customs do not compete with Jesus’ finished work.