From Search Engine Journal:
“WordPress 5.5 rolled in August 2020 and soon after millions of websites across the Internet broke. Get ready because WordPress 5.6 has the potential to do the same thing.
One of the WordPress developers behind the jQuery Migrate Plugin said in a support thread that the plugin would become “useless” once 5.6 rolls out. Anyone still depending on it in December will experience the rubber bands snapping off their sites all over again.”
The article goes into some detail on why the update in August broke many sites and why the 5.6 update might as well.
At ProtectYourWP.com we’ll be very cautious about this update, insuring we have a clean backup prior to updating. See also our post about testing on a staging site.
If you want to be extra careful about your updates, consider signing up for our Automated Visual Testing.