Editing not working with Brizy pagebuilder

I’m using the Brizy pagebuilder and the plugin works when I 1) build the page, 2) turn on the plugin on (and if I want to edit the page I turn the plugin off, edit, then turn back on). What doesn’t work is editing the page while the plugin is turned on, no matter what combination of “PHP Server-Variable” and “Enhanced compatibility mode” I have.

Specifically, with “PHP Server-Variable” on default “$_SERVER[“SERVER_NAME”]” and with the compatibility mode “On”, and with “https://domainB.cz” mapped to “https://domainA.cz/page”, when I try to edit the page, I see the brizy plugin loading and the debug console has these two relevant messages:

GET https://domainB.cz/%7B@brizy_SITE_URL_PLACEHOLDER@%7D/?brizy_media=wp-7cc006bdd60a87002957bf2bd7d40289&brizy_crop=iW%3D293%26iH%3D283%26oX%3D0%26oY%3D27%26cW%3D293%26cH%3D235&brizy_post=1946 404 (Not Found)

GET https://domainB.cz/%7B@brizy_SITE_URL_PLACEHOLDER@%7D/?brizy_media=wp-7cc006bdd60a87002957bf2bd7d40289&brizy_crop=iW%3D120%26iH%3D116%26oX%3D2%26oY%3D0%26cW%3D116%26cH%3D116&brizy_post=1946 404 (Not Found)

I have enabled CORS. The log still contains 2 CORS-related messages but they only have to do with two embedded frames (youtube and maps) and show up even with the plugin disabled and the pagebuilder working, so I’m pretty sure they are not the problem.

(I’m happy to provide screenshots but here I already gave all the information the screenshot would convey.)