Hi @tomazzi,
Good question. This WordPress update should not have affected this plugin.
It seems more related to a theme update or to a plugin update. There are many plugins and themes that don’t use the standard way to add content to the admin footer and overwrite the content.
The easiest way to check is to disable all plugin and only leave our plugin activated and see what happens. If it shows the content in the admin footer, one of the plugins has a conflict. In order to detect which plugin causes the problem, activate one plugin after another and see which one is the one that causes the problem.
If it’s not a plugin, please revert to a standard WordPress theme and see what happens.
Please send us the information of your tests.
Best regards from Spain.