Wordpress has the archive of the previous version that you can download from there and install manually.
But check accessing the site when not logged in (like the public does), because from what the others are saying the issue only happens when you are logged in and not in the public site
Weaver Xtreme 4.4.7 fixes the issue which was an inadvertent debug message used to solve an issue when trying to use replacement widget areas when a site was moved to a different URL.
Same issue here. R4.4.6 installed last night (3/22/21) breaks all per-page widgets selected on a page. A pop-up indicating the ID, etc. stops the website from loading until you click “OK”. (Sure looked like a debug message). This happens when to all, not just logged in folks.
Looks like I should install R4.4.7…will check for an update….Thanks.