Billing form fails to support navigation with the Tab key

When entering information in any web form it is standard that the Tab key will move you to the next form input. Discord's form for entering billing information is failing to do this. Hitting Tab shows that the cursor moves to the next form input, but as soon as you try to type anything, the cursor disappears. Subsequent hits of the Tab button highlight the X button in the top right corner and then the first form input as if you were starting again from the top. This failure of a basic behavior of web forms lowers my confidence in Discord, especially when doing something as sensitive as entering billing information.