As a Messianic Jew, a careful reading and study of the 4 Gospel accounts reveals that in fact, the last supper was just that, supper. It was not a seder of any kind, but what Yeshua was doing was the kiddish, the blessing of the bread and wine that we do every Shabbat. In this account of the kiddish, Yeshua adds greater meaning to the bread and the wine.
See John 6:48-71
Yeshua was the Passover sacrifice, but He is also the bread (manna) and the wine (blood) of the Word. We must be careful not to confuse the two lest one finds themself being deceived when the false one appears!
May you have a blessed Shabbat! Shalom!
13 And He sent two of His disciples and said to them, "Go into the city, and a 14 and wherever he enters, say to the owner of the house, 15 "And he himself will show you a large upper room furnished and ready; prepare for us there." 16 The disciples went out and came to the city, and found it just as He had told them; and they prepared the Passover. 17 When it was evening He came with the twelve. 18 As they were reclining at the table and eating,.... Clearly Yah'shua eat the Pesach Seder. Shabbat Shalom ! I recommend for your understanding
shalom b'SHEM Yah'shua HaMashiach
Mark 14: 12-18 12 On the first day of Unleavened Bread, when the Passover lamb was being sacrificed,
Or Luke 22:8-14
His disciples said to Him, "Where do You want us to go and prepare for You
to eat the Passover?"
man will meet you carrying a pitcher of water; follow him;
'The Teacher says, "Where is My guest room in which I may eat the Passover with My disciples?"'