WordPress 5.5 was a landmark update among the recent updates for the most popular CMS on the internet.
Being a major update, it did have its share of issues that came right after the update.
It lead to a lot of compatibility issues with major themes and plugins on the platform.
The latest announcement from WordPress is that of a Maintenance Update release, WordPress 5.5.1 that could possibly fix the issues with version 5.5 that broke millions of websites all over the web.
Read more about the update details here
Source: SearchEngineJournal