"Default search engines" preference is missing search engines on Android

Summary

See title and screenshots

Steps to reproduce:

How one can reproduce the issue - this is very important.

1. Go to ⁝ (kebob menu) -> Settings -> Search -> Default Search
2. Notice that there is only "DuckDuckGo" and "Google"
3. go back to the home screen
4. tap the search icon to the left of the search (i.e. DuckDuckGo icon)
5. notice that there are many more search engine options

Relevant logs and/or screenshots