Studio Fields are not showing borders after upgrade from version 11.2.0-dev1 to version 11.3.0-dev1

Hi Team,

Recently we have upgraded our dev instance from version 11.2.0 dev-1 to version 11.3.0dev-1(we are using ENT edition for upgrade)

What we have observed is, we have upgraded successfully but in Studio section when we edit any fields its not showing any borders.

could you please help us to figure out this is feature or any bug in newer version of SugarCRM.

Note: we have upgraded instance at our dev server(on premises server).

Please see screenshots for references.

1.Without Borders:

2.With borders:

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