Why was Faust Part II published after Johann Wolfgang von Goethe’s death?

Johann Wolfgang von Goethe sealed the manuscript of Faust, Part II in August 1831 with the explicit intention that it be published only after his death.1

While Goethe had drafted a few passages for the second part as early as 1800, he spent his final years meticulously completing the work as part of his effort to organize his literary legacy. By the time he finalized the manuscript in 1831, he felt he had completed his life's work, remarking that any remaining time was a "pure gift". He died the following spring, in March 1832, and the work was subsequently released.1