Preview Changes – save_post hook not firing every time

Hello everyone,

I have issue I’ve been struggling few days already and couldn’t find a problem so I hope someone has an idea.

We have our own page builder for all our buyers so they can build pages easily. Problem I encounter is that when user adds new element to page builder grid and try to preview the results, hook “save_post” doesn’t fire. Actually it fires every second time.

I search all over the web and my conclusion is:
– when user clicks on Preview Changes, WordPress store post Revision
– Hook “save_post” will fire only when there are changes in WordPress editor. Because user is adding content through page builder and nothing actually changes in WP Editor those changes are not detected.

I tried changing tinyMCE “isDirty” parameter on two different ways when user adds content to page builder:

tinyMCE.activeEditor.setDirty(true);
tinyMCE.activeEditor.isNotDirty = false;

Neither is working.

I assumed that changing this parameter when user adds new element to page builder will force firing save_post hook every time but unfortunately it doesn’t.

I also tried to track “save_post” hook in WordPress core files to find how and when it fires but this ended without results.

I think that page builder is not important at all in this case as I actually need (probably) to simulate change in WP Editor to force save_hook to fire.

I am out of ideas so I would appreciate if someone has idea how to resolve this.

Thank you,
Vladimir