Why is the Oracle Apex Apex_application.G_FNN.COUNT returning 0 in apex 5.1.3 interactive grid

Question

I have an Interactive Grid with 7 Columns exclusind Row Selector and Row Action. The Columns are named aaa, bbb, ccc until ggg (7 cols).
I want to validate this columns, also the ones who where just being added.
Reload on Submit in the Page Attributes is set to "Only on Success", because the other Option("Always") isnt compatible with an editable Interactive Grid apex says when trying so.

. so basically i tried accessing the Apex_application.G_FNN when the grid is sent with ajax and a APEX_AJAX_DISPATCH request.

You cant access the save button and cannot change its properties. its auto-generated. i was also suggested adding a before submit process which is not possible because it doesent exists in my version of apex (afaik)

Then tried adding a click dynamic action to the button(query selector which works) which submits the save button with a SAVE request and the page reloads when clicked.

This also doesen't work. Apex_application.G_FNN.COUNT stays 0.
I guess that ajax submits it before the SAVE Request.

i also tried adding a custom save button in apex which also submits the page. That also doesent work.

There is data in this ig and its coming from a database partly, but you can also add new data which should be accessible in the Apex_application.G_FNN variables then.

What should i try next to be able to use this Values?
I am open for suggestions and i know a update would be good and its coming in the next weeks but this doesent solve the problem, since i still need to validate the IG values then. What are your ideas on this? I will be trying them on monday in the office.