“My Content” in Marketplace not showing when using Custom Language Pack

When using a custom lang file or custom language pack in Minecraft Bedrock Edition, the My Content tab in the Marketplace does not display any of my purchased or owned content.
Switching back to an official language (such as English) makes the content appear again as expected.

Steps to reproduce:

1. Install and enable a custom language pack (.lang file)

2. Launch Minecraft Bedrock and open the Marketplace.

3. Go to the My Content tab. Observe that no content is displayed.

Expected result:
The My Content section should display all owned/purchased packs and templates, regardless of whether a custom language is used.

Actual result:
When a custom language is active, the My Content tab appears empty.