Modules not included in sub-page

Description

If you add a page with a sub page to a project using the Languages gadget and choose "Add all children" and "Add related contents that need translation," then all text and modules from the first page are included. But, if you download the Translation Package from the child page, only that text is included.

Steps to reproduce
1. In an Alloy templates site, create a project with the name "Translation".
2. Create a page (page 1) with a page name, page description, main body text, and add an "Alloy Meet" teaser block.
3. Create a sub page (page 2) to page 1 with a page name, page description, mainbody text, and add a "Customer testimonial wide" teaser block.
4. In the Languages gadget, choose "Add to translation project".
5. In the pop-up window, choose your "Translation" project, tick the box "Add all children" and "Add related contents that need translation," and press "OK".
6. In "Options," press "Download Translation Package".
7. Open the downloaded compressed file
8. Notice that all text and modules are included from the first page. But from the child page, only the text is included.

Expected:
In the downloaded compressed file, you should find that all text and modules are included from the first page and from the child page.

Actual:
In the downloaded compressed file, all text and modules are included from the first page. But from the child page, only the text is included.

EPiServer.CMS.Core 11.9.2
EPiServer.CMS.UI 11.5.4