Can't assign a role to a subtask

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Windows 10. Application for desktop.

Assigning a role for a subtask through underlined tab http://joxi.ru/BA0obEMTBywjn2 doesn't work. 

Role just isn't assigned. 

Doing the same through http://joxi.ru/RmzZQGeCW9Gbym works fine. 

App:
Windows app