Extendet field in RUI LiveActivity

Hello, Experts!

I have difficulties in mapping extension fields in the activity panel in RUI
Fields that I added to the activity bar. They work fine in HTML5.
screen https://i.imgur.com/sqqMB85.png

Further I updated them in RUI. The screen https://i.imgur.com/ku6KlAY.png

When the panel is open and I DO NOT simulate the call, the list fields are active. Screen https://i.imgur.com/9vD9Evq.png , and https://i.imgur.com/t2yASQF.png. I can make a choice in list.

After simulating a call, I can not make a choice in the extension list. The fields are gray, not editable. Screen https://i.imgur.com/Rx1rFF8.png

Please clarify what I'm doing wrong?
Maybe a problem with Fiori?