Breaking Elementor Pro

For some reason this plugin keeps breaking Elementor Pro editor. The pages are loading and redirection works, but the Editor fails to load. This is happening across a number of pages now and is preventing us from going live.

We’ve attempted to disable the plugin, but then all the pages show a 404.

Happy to offer a login so you can see for yourself.

Elementor Version 3.0.4
PML Version 2.2.8.9

Failed to load resource: the server responded with a status of 404 ()
editor.min.js?ver=3.0.7:2 Uncaught TypeError: Cannot read property 'data' of undefined
    at initSettings (editor.min.js?ver=3.0.7:2)
    at initialize (editor.min.js?ver=3.0.7:2)
    at i.h.Model (backbone.min.js?ver=1.4.0:2)
    at new i (backbone.min.js?ver=1.4.0:2)
    at o.value (editor.min.js?ver=3.0.4:2)
    at o.value (editor.min.js?ver=3.0.4:2)
    at editor.min.js?ver=3.0.4:2
    at Function.v.each.v.forEach (underscore.min.js?ver=1.8.3:2)
    at o.value (editor.min.js?ver=3.0.4:2)
    at Editor.<anonymous> (editor.min.js?ver=3.0.4:2)
?elementor-preview=1673&ver=1600703535:1 Failed to load resource: the server responded with a status of 404 ()

The page I need help with: [log in to see the link]