[Forminator] Integration with Zapier sometimes doesn’t send data

I’m using an integration of one of my forms with Zapier. I’m using GA Connector to fill in some hidden fields (added as a hidden HTML field in the form).
The issue is that sometimes those hidden fields get sent to Zapier, and sometimes not. We’ve checked those during the chat and our guess is that it may be some sort of limiting on the Zapier side – either field length or the amount of data maybe?
Not sure about that though. Can you help debug this and find the source of the issues?