If you select a Channel Points reward that doesn't accept any text-input, a "Back"-button is shown in the upper left corner, along with the "Close"-button in the upper right corner of the dialog.

If you instead select a reward that accepts text-input, the "Back"-button is gone, so the only way to get back to the rewards overview is by closing the dialog completely and then reopen it.

Not only is this a slight annoyance for your average user, but it's an even greater annoyance for visually impaired users.

Additionally, the "Back"-button in the rewards dialog is missing a description in the aria-label making it almost useless with screen readers.