Dear Toufiq, I find your explanation untechnical and inadequate to solve the problem.
This test site is hosted on a specific hosting for joomla where we have several sites in production, J3 and j4, without problems, with your products (template & pagebuilder 3.x).
On this site, the editing of pages created with Pagebuilder goes smoothly, there are no blocked resources.
Why do pages work and articles from .json file do not work?
If I inspect the article I reported to you there are errors in the console, but they don't seem to be blocked resource errors.
https://i.imgur.com/6wjVDLn.png
These errors are not there if I inspect a page made with pagebuilder.
I have the utmost respect for your work, and I understand that the launch of a new product puts stress on the structure, but responses of this kind are not acceptable.