[NSFW] WPBakery Page Builder 6.6 not work when save a page

I recently upgraded at my website, the theme(BeTheme) and WP version to 5.7
after install the new theme and pre-packed plugins, on each save of the WPbakery Visual Composer, goes to a 404 page (post.php) sometimes i got a 403 error, but i forgot how to replicate that one.

-happens on backend and frontend editors.

i have tried without success:

-upgrade/downgrade WP core versions (4.98 to 5.6 and anything in between).
-disable 3rd party plugins and enable on-by-one.
-re-save permalinks (also different combos of permalinks)
-install the classic editor, tampering with the roles permission in the wpbakery options…
-update/downgrqade wpbakery plugin
-I have CREATED A NEW WEBSITE, version 5.7, default theme, just WPbakery installed, and still the same… SAME!.
im going nuts guys… im running low on options.
i need some fresh mind to come a give me a little perspective.