WordPress 5.5 is largely a success. But there have been numerous conflicts from themes and plugins that caused sites to break. Arguably the biggest issue stems from WordPress’ decision to remove the outdated jQuery Migrate.
The first step of the process of modernizing WordPress was removing the jQuery Migrate 1.x in WordPress 5.5. And that’s what is causing some sites to break.
Some WordPress themes and plugins are using older jQuery scripts, which is causing a range of problems.
According to WordPress page for the jQuery Migrate Helper:
“With the update to WordPress 5.5, a migration…