No, it does not make your 1099B "noncovered". If the 1099-B does not report the basis of your investment and you have documentation that supports the basis or you know what your basis is, you can go ahead and enter the basis. I believe there is a question that asks if the 1099-B reported the basis. You would respond or check a box that says the basis was not reported on your 1099-B. You may want to attach a copy of your documentation that shows your basis. You should be able to attach a PDF of this documentation to your return before e-filing.
If you do not have the documentation available and you do not want to delay e-filing, you can go ahead and e-file, but I would recommend getting the documentation ready in the event you get a letter from the IRS asking about backup for the basis. I would just put the documentation with the rest of your tax documents for 2021.
