I can get over that, but I've used a couple of websites where hitting enter in the code box doesn't submit the code and log you in - that is unforgivable.
Also the sites that autosubmit once you’ve typed 6 characters, and worse still the sites that require you to login again from scratch if you typo the last character and it autosubmits
Blowing away the form on submission is the worst sin if form design. Only blow it away if it was accepted!
I wonder if this is a deliberate (legal) submission reduction technique.
Probably closer to the PM didn't specify, the PO had a deadline, the Scrum Master wanted a lower estimate, the devs don't want to argue, and QA followed the acceptance criteria and didn't want to be seen as an impediment, especially since the devs had already surrendered.
I love the auto submit on auth codes
Similarly, disabling pasting a copied code.
There's this one page that disables the login submit button until the password field is filled. The browser auto-fills, login still disabled. Need to manually add and then remove a character before the form can be submitted.