We haven’t received any additional details via the support email. Therefore, I took the liberty of conducting a quick test using the functionality with Pinegrow 7.6 on macOS on a standard & ultra basic theme quickly build for the occasion. From the main loop, I successfully imported the content from WordPress without any issues. You can see the process in the attached video.
Note: broken images placeholders are visible because the live site content is also a bit broken (I did the test in a hurry from an old wp instance), its not related to any issue with the import.
So, it seems crucial to have more information regarding the use case of the functionality when it does not “work” as expected. This will allow us to provide more targeted assistance and resolve any potential issues more effectively.