I noticed that in iOS Safari. Reduce Transparency brings back the bottom toolbar containing the search/URL field and buttons, but there’s zero padding between the buttons and the edge. Makes it fairly obvious that nobody tested it.

Enabling Reduce Transparency is a sure-fire way to find a dozen bugs within a few hours. It is always quite apparent no one who is empowered tests it at Apple. At least the padding issue is the one Feedback report I sent that got the “more than 10 similar issues” label so it may actual get fixed.