The keyboard layout is reset after each keystroke. For example, the keyboard exits the numeric layout after typing any character as can be seen in the video below:

Recorded on a Google Pixel 7a running Firefox 149.0. The keyboard is the default keyboard that came with the phone (Gboard).

This happens on anything with a text input.

The expected behavior is to be able to type multiple numbers in succession without having to switch back to the numeric layout every time.

I suspect the issue is caused by these lines added in #4855:

Edit: I can confirm that removing those lines fixes the issue.