setSlicerState method not working for parameter textbox in report

Hi, While the setSlicerState is working for all the visuals in the report, it doesn't seem to update only the parameter textbox visually even though I can see the state change effects on other parts of report.

No matter what value I set using the setSlicerState method, it just remains as it is i.e. 1

Here's the filter I send to apply the new slicer state

The value '66' is not applied in textbox, value remains '1'

As for its visual descriptor: here it is

As you can see, the type is slicer, so should change the value of parameter textbox, but it doesn't.