Toilet wouldn’t flush unless you held the handle down. There is a hole in the side of the flapper, and one in the bottom. A little tape on the side hole and everything works fine. Yeah, it’s not a proper fix, but it’s cheap and it works and nobody has to see it.
And one weird thing about the flapper in my toilet - it was made in Colombia. I rarely see anything in the US that was made anywhere in South America, and I wouldn’t have assumed that you’d be able to find plumbing parts here that were made there, but there it is.