Steps to reproduce the issue

1. Site Modules: Select Language English
2. Switch to Admin Module: Only Modules for English are shown.

For language filtering of admin modules the default-option is set to No.

The screencapture show:

1. Site Module without filter
2. Admin Module without filter
3. Site Module with language filter english
4. Admin Module
5. Site Module with language filter persian
6. Admin Module

Expected result

Admin Module for all languages are shown.

Actual result

Only admin modules are shown for language selected for site modules.

System information (as much as possible)

Additional comments

In j3 it works as expected.

Maybe its expected but its not possible to set different language filter for site and admin. I guess it's not needed.