After adding support to access machine translation from the language selector on mobile web (T363183), the "Language not found" view was adjusted to show the option to write a translation and, when available, the option to read a machine translation.
As illustrated in the video below, after searching for a language for which options are provided (Igbo), the search is extended with additional text that does not match any languages. As expected, the options are not provided after the modification. However, editing the text again to the original value (Igbo), remains with the option not showing.
This is illustrated in the video below: