In Nechemia ch.8:13-15
And on the second day, the heads of the fathers' houses of all the people, the priests, and the Levites, gathered to Ezra the scholar, and to understand the words of the Torah; And they found written in the Torah that the Lord had commanded by the hand of Moses that the Children of Israel dwell in booths on the festival in the seventh month. And that they should announce and proclaim in all their cities and in Jerusalem, saying, "Go out to the mountain and bring olive leaves and leaves of oil trees, myrtle leaves, date palm leaves, and leaves of plaited trees, to make booths, as it is written... And the people went forth and brought [them] and made booths for themselves, each one on his roof and in their courts and in the courts of the House of God, and in the square of the Water Gate, and in the square of the Gate of Ephraim. And all the congregation of the returnees from the captivity made booths and dwelt in the booths, for they had not done so from the days of Joshua the son of Nun until that day, and there was exceedingly great joy.
which implies the people forgot the mitzva of sukka. is this correct?