Are Schedule K-3 forms really not available until late in the year? (Tax Year 2021)

I received a Schedule K-1 (Form 1065) which has a check box stating "Schedule K-3 is attached" but it's not attached.  The K-1 instructions say the K-3 will be available by August 31, 2022.  And when I enter the K-1 info into TurboTax, it says the IRS is still working on finishing up the Schedule K-3.  Will I really need to wait 6 months to be able to complete my tax return?