On commerce SDK, data bind is not working for dual display but it is working for normal POS view

[zhangguanghuib]

We are implementing dual display function following this doc: https://learn.microsoft.com/en-us/dynamics365/commerce/dev-itpro/pos-dual-display-extension
And we found the data-bind is not working for Dual Display, but the same way of data-bind is working for the normal POS view.
Thus we need Store Commerce Framework team to take a look what's wrong with our code.

Detailed repro steps from user perspective:

1. Following this doc https://learn.microsoft.com/en-us/dynamics365/commerce/dev-itpro/pos-dual-display-extension to implement dual display function.
   The normal steps is to enable dual display on hardware profile:
   

2. And the code is also available from here:

https://github.com/zhangguanghuib/NewCommerceSDK/tree/main/POS_Samples/DualDisplay

3. We found the data will not be able to show on the dual display:

Research Steps taken/Troubleshooting Performed:

1. We tried the same thing on the normal POS page, and it is working fine:
   
   
   You can go to Show Journal->Find the new command button we added->Open the page to verify

2. But the same code including typescript/html code, the data is not able to be showing on the dual display:
   
   

Please help check if there is anything wrong in your code, thanks.

You can find the whole project from here https://github.com/zhangguanghuib/NewCommerceSDK/tree/main/POS_Samples/ExtensionPropertiesSample
Then then easily test the code in your dev environment.