JSON Forms: Problems with reading "data" object

Hello,

I am having trouble with one of the forms. It suddenly stopped working. After some debugging, I discovered that values read from the "data" object are empty.

As an example I print the following values to console:

The result is very strange. When only data is printed everything works as it should. If I try to do other stuff, the values from the datagrid component "pogodbe" are empty.

What troubles me the most is that there was no change of the forms to my knowledge. How can something so trivial brake over night? The same form still works in my test environment.

I am open to any suggestions of how to resolve this problem...

Best regards, Nik