Problem with multi-language custom fields in backend preview

[heinrob]

Describe the bug
I have set up a custom PageType with some text fields in a site configuration with multiple languages. Displaying the values in the backend preview works perfectly fine for the default language. However, translating the page and inserting other values still renders the backend preview of the default language while the frontend as well as the rest of the backend display items in the correct language. This also produces an edit link to the wrong language using <be:link.editRecord>. Debugging the data.languageId field always shows 0 regardless of the pages language.

To Reproduce
Steps to reproduce the behavior:

1. Configure a multi-language site in /config/sites/[main]/config.yaml (https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/SiteHandling/AddLanguages.html)
2. Configure a custom PageType including a field of type Text or Textarea
3. Add a backend-preview.html and display the field. Debugging the values is also sufficient: <f:debug>{data}</f:debug>
4. Add a page of that type in the backend and fill with values
5. Translate this page to another language and view the rendered backend preview

Expected behavior
The displayed values should show in the correct language and the link to edit the entries should lead to the edit page of the respective language.

Screenshots

Explanation: this is the default title field, so the value for "Title:" should be the same as the headline above in this picture.

TYPO3 Version
13.4.4

Content Blocks Version:
1.1.5 & 1.1.6

[nhovratov]

We will have a look if this is feasible.