@arnaudbroes No, the new versions of AIOSEO “clear” this icons in the webmaster administration (at the post edit admin page), I try to put that icons at the posts titles & meta description but now plugin don′t allow, icons now doesn′t store at database too. I downgraded AIOSEO to 3.7.1 version and it works fine. I tried to activate “Twenty twenty” theme but this is an admin bug in new/edit post page on administration.
Try to add some icon (?? ?? ? ?? ?? ?? ??) on post title or description and check that plugin doesn′t allow that now.
I tried new version in most websites with the same error, and another webmasters tell me that they have same problem.
I use last WordPress versión (5.7). Thanks for your support! I look forward to hearing from you, regards