Asking for a friend, how builds her website using the plugin and now gets the message “This block contains unexpected or invalid content” instead of the grid.
It is possible to convert the block into HTML, but then it leaves only the wrapping divs without the content.

Not sure since when the problem exists. In some posts I could restore the revision and somehow it worked. Mysterious. Someone knows something about this?

WordPress Version 5.5.3
Plugin Version 1.0.7
PHP Version 7.3.22-nmm1