I contacted their support directly and this was the response:
“The error is a result of a change that WordPress made in the latest version.? Our Engineering team is working on a fix now and we’re hoping to have it out as soon as QA testing is completed.??
The error should not be displayed on the webpage.? That means that in your wp-config.php file you have set?WP_DEBUG_DISPLAY to true.? ?If it isn’t then you likely have to reach out to the hosting company to determine what setting is causing PHP to display warnings, errors, etc on the live site.”
I mean, yes I have errors enabled purposely as this site is in development. That doesn’t mean it still shouldn’t be reported, no?