Hello, I'm writing a block where I read from a table then evaluate some data in a PHP function and at last save them using "Save Data". To do that I set up the Data overrides like this

after saving it works fine but when I open the block again the situation is like this

and so it doesn't work anymore, where I'm wrong with it?

after saving it works fine but when I open the block again the situation is like this

and so it doesn't work anymore, where I'm wrong with it?