Default value for the custom column which set by SharePoint REST API does not show on the document library when upload a file
Here are the steps to reproduce the issue:
- Create a new Modern team site collection not connected to M365 group by using PowerShell command ( New-PnPSite -Type TeamSiteWithoutMicrosoft365Group).
- Create a new list in the new site and open list settings. Advanced settings -> Select Yes to Allow management of content types and OK.
- At the settings page, select Add from existing site content types from Content Types.
- Add a custom content type and select OK. This will add custom columns in the Columns section at the settings page.
- Create a new document library and add custom columns you created at the step 4.
- Set the default value for the column by using SharePoint REST API.

It will set the default value; however, when upload a file to the document library, the default value does not show.
The default value will only show with following manual steps after the step 6.
Go to Site Columns -> Edit Column for the custom columns and click OK button without changing anything. The below dialog pops up and click OK.

Is there anything I can do in order to show the default value without any manual steps?