There should be more information. You can ask for the info.
Basically it seems that code ZZ is a catch all information that you may need to manually enter somewhere else in your tax return. Most of the common things are more streamlined (e.g. box N goes on schedule XYZ, line M), but some things are rare or too complicated. I have no idea what they might be for you or of it they really matter. For example, I have seen trust k1s (not partnership k1s) where code ZZ is used to report amount of US government interest included in the interest/dividends boxes. That is important because states cannot tax US government interest.
https://www.irs.gov/instructions/i1065sk1#en_US_2023_publink1000128111
Code ZZ. Other. Any other information you may need to file your tax return.
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