I believe, and again, not an expert on this, that the capping of sick days towards retirement is a major issue and can ultimately cost teachers thousands per year in retirement and salary.
However, I think their biggest point, and rightfully so I'll add, is the optics of attaching a 291 page bill that no one had read, and had had no actuarial review, to the back-end of a sewage bill at the 11th hour. That looks like the opposite of being "represented" by your Representatives.