No confirmation dialog box for name changes on account.mojang.com

The bug

Previously, whenever you tried to change your username on account.mojang.com, a dialog box would appear as soon as you clicked "Change name", confirming that you really want to change your name.

This dialog box doesn't appear anymore.

WARNING: Don't smash your hands on your keyboard when choosing a name while trying to reproduce this bug or you'll end up like me, asuifjesg893.