The WordPress 5.5.1 maintenance release is designed to stop sites from breaking. But the errors will still need to be fixed.
WordPress described the issue like this: “In WordPress 5.5 the global JavaScript objects listed below were removed without being deprecated. WordPress 5.5.1 adds a backfill for these globals so they no longer cause JavaScript errors.”

Millions of Websites Affected

The spreadsheet revealed the previously unknown amount of sites that were broken.
There initially was casual speculation that the impact was relatively small and limited to thousands of websites. But that wasn’t the case.
WordPress 5.5 negatively impacted millions of websites.

#wordpress #fixes issues #fixes millions of broken sites