What do we know about the Council of Nicaea's ban of celebrating the Lord's Supper on the day before Passover? I was reading the wiki on Constantine the Great and was struck by this passage:

More significantly, in 325 he summoned the First Council of Nicaea, most known for its dealing with Arianism and for instituting the Nicene Creed. He enforced the council's prohibition against celebrating the Lord's Supper on the day before the Jewish Passover, which marked a definite break of Christianity from the Judaic tradition. From then on, the solar Julian Calendar was given precedence over the lunisolar Hebrew Calendar among the Christian churches of the Roman Empire.[232]

The footnote points to this source but it seems not to say anything about the &quot;Lord's Supper&quot; or Passover at all:
https://www.newadvent.org/fathers/25023.htm
Was there such an edict and if so, where might it be documented?
We know there was a conflict in the very early church about the 3-day observance of Christ's death, burial, and resurrection.  Some wanted to observe the 14th (Passover), which came to be called the Last Supper.  Others wanted to observe the resurrection, which came to be determined about Sunday sunrise.  The Council of Nicea met to discuss the issue, among other issues.  They decided that overlapping observances was to be avoided.  Constantine was the guarantee.  Here is his letter to the churches.

When the question relative to the sacred festival of Easter arose, it was universally thought that it would be convenient that all should keep the feast on one day; for what could be more beautiful and more desirable, than to see this festival, through which we receive the hope of immortality, celebrated by all with one accord, and in the same manner?  It was declared to be particularly unworthy for this, the holiest of all festivals, to follow the custom [the calculation] of the Jews, who had soiled their hands with the most fearful of crimes, and whose minds were blinded.  In rejecting their custom,113 we may transmit to our descendants the legitimate mode of celebrating Easter, which we have observed from the time of the Saviour’s Passion to the present day [according to the day of the week].
https://ccel.org/ccel/schaff/npnf214/npnf214.vii.x.html

So again, their goal was to observe a resurrection feast for all the churches on the same day.  At the same time, the goal was to avoid said feast on the same day as Passover or Unleavened Bread.  The difference would be to observe the feast on a day of the week (Sunday), rather than on a date as determined from Scripture (the 14th Passover).  The decision was made therefore to observe Easter on the first Sunday following the first full moon (the full moon was typically the first day of the Feast of Unleavened Bread) after the Spring Equinox.