Setting value to calc field in mobile client javascript

Hi, all.

I am using MS CRM 2016 on-Premises and the last mobile application Dynamics 365.

I have a script on entity form, binded to field A change event.
On the OnLoad event, I am setting submit mode on field B as "Never".

 Xrm.Page.getAttribute("B").setSubmitMode("never");

It shows calculated field B and assignes a value to it by   Xrm.Page.getAttribute("B").setValue(value) .
It works fine in web-client.

But in mobile client the setValue method is invoked and value is assigned (I checked it through debug), but it doesnt show in the field, even after page refreshing.

Are there any difficulties or special features, while working with calculated fields in mobile client?
What am I doing wrong?

Thank you.
with regards, Yuriy.