Dashboard: Selecting links in sidebar results in 404

On a few different sites we run, I’ve noticed that when in the Dashboard, selecting menu items like “Plugins->Installed Plugins” or other menu items (in one case “Wordfence->Scan” results in a 404 error.

Rebuilt the permalinks, .htaccess : still no joy

What would cause this? I’ve come across this a few times over the years

Latest WP
PHP 7.3
LAMP Stack
Lots of memory & disk space

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