Need to review to see if this is still an issue and if there are any other instances of this bug.
From @fuzzbomb:
Something really confusing: there's a form_alter which adds .visually-hidden to the search form submit button. For a sighted keyboard user the button will be operable, but not perceivable. Could also cause difficulty for touch screen users, speech control, or users who input text with something other than a keyboard. A visible button is safer.
Need to review to see if this is still an issue and if there are any other instances of this bug.
From @fuzzbomb: