Schedule K-3

In the Schedule K-1 I received box 16 is checked ("Schedule K-3 is attached"), but the Schedule K-3 is only going to be available "by August 31, 2022."

Should I:
1. e-file my taxes with Box 16 checked and no schedule K-3, or
2. uncheck Box 16 in Schedule K-1 and then file, or
3. any other suggestion?