I thought this might be useful to share , we run into an issue where we used the new command bar editor to create new buttons and All was good till we added a new column to the same table and published all customisations, went to the Command Bar and tried to set the visible property using Power FX formula but unfortunately the new column did not show up.

So by contacting Microsoft this is a known issue as of now and as a work around you need to follow the below steps:

1. Go to the Solution -> Choose the app ->Select the table -> Right Click Edit Command Bar.

3. Choose the Command Bar you want to Edit

4. Select your customised button and click Open Component Library

5. Component Library will be loaded on the Menu Click File -> Save , Then Publish and then reopen the Command Bar ,your metadata will be refreshed.