Our library gets taxpayer funding from its own line on a school district tax bill. We know this "259" funding is a recurring tax that can only be changed with approval of the voters. That said, this year the total amount remitted by the school district was reduced due to "corrections" made after the tax bills went out.
The short answer is yes, it's true. A school district tax levy, even if it’s a separate line on a school district bill in support of a library, can be reduced if a taxpayer challenges their assessment after the tax bills go out, and yes, since 2022, a library may have to refund overpayments.