After a dispute whether she’hechiyanu is said on Rosh haShana and Y”K or only the 3 Regalim, the Yerushalmi (71a vilna ed) at the end of Pesachim raises a question of why having megillah read on Purim on the 14th and 15th of Adar is not a problem of lo tisgodidu. What does that have to do with the topic at hand? The Korban haEidah tries to tie the sugya together by suggesting that the differing practices re: she’hechiyanu prompted the question, but the Ridba”z has a more creative approach. The Yerushalmi often cites chunks of a sugya out of place, and this is one of those occasions. The previous Mishna told us that there are four different ways to teach the haggadah which correspond to the four sons alluded to in the Torah. This chunk of gemara belongs to that sugya: why does having four different ways to do a mitzvah not constitute lo tisgodidu, or in the case of Purim, why is having two dates to celebrate the holiday not lo tisgodidu?
So much for the Yerushalmi’s question. Maybe more later on the answer, which daf yomi (bavli) learners encountered not too long in the past in Tosfos Yevamos 14.