SiteOrigin Page Builder causing 413 Request Too Large

Hi all,
I’m having a problem while saving posts on my site, which is using Page Builder.

When I save a post, WordPress blocks giving error 413 Request Too Large.
Searching on the internet, I’ve found some similar issues (not related to Page Builder) solved by increasing

post_max_size

inside

php.ini

file on Apache.

The strange thing is that on my dev site, I’ve got a

post_max_size

of 8MB, and that is not giving 413 Request Too Large error, but on the live site, the

post_max_size

is 64MB.

Using Chrome Dev Tools, inspecting DOM and removing

<input name="panels_data">

seems to solve this problem.
So, I don’t know if it could be a Page Builder bug, but here is what I did:

On the dev site, same WordPress settings, used Duplicator plugin to clone the site for going online;
On the live site,

php.ini

settings are higher than dev ones

On Page Builder settings, under “Content” block, all 3 checkboxes are unchecked