Blocks are not correctly rendered in admin edit view, shows empty blocks #1457
Description
Recently Industry team has raised issue that some of the cards blocks doesn't show up in admin edit view but in actual cards exists. Please find attached screenshot.
When navigating cards or boxes within a 'container', they often don't show properly up on the edit screen, leaving me guessing and clicking roughly where they might be to then edit the content.
It is clumsy and takes extra time just clicking within the container window to find them, to be able to highlight them and bring up the edit settings on the right hand side.
This is an issue on multiple pages. Happens with Person block as well.
This is an example, see screen shot, from 'publications' on this page. There are 4 boxes there all with content, but only 1 is previewing on the edit screen, and the other three are invisible! : https://www.ebi.ac.uk/industry/industry-programme/
