Document library custom column missing

What type of issue is this?

Question

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Target SharePoint environment

SharePoint Online

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

• browser version
• SPFx version
• Node.js version
• etc

Issue description

We have both English and Norwegian tenants.
In the English sites, provisioning works as expected: all lists, libraries, and custom fields are created correctly.
In the Norwegian sites, during site provisioning the default Delte dokumenter library is missing some of the custom columns.

All required fields are declared in our JSON, and the site design is generated correctly. When the site design is applied, all lists, libraries, and fields are created as expected — except the Delte dokumenter library, which does not include the custom fields.

The issue started occurring after mid-August.