Cognito Hosted UI ignores custom color for email verification input field

When using Cognito's Hosted UI for user sign-up, in the first screen with username, email and password the input fields use the color property from inputField-customizable as expected.

Then on the second screen when the user is asked for the verification code sent to the provided email address, the input field's class is NOT inputField-customizable, and so the text's color is from the background-customizable class.

In our case that color was white (the background is dark so white text worked well), but then the user couldn't see any visual feedback while typing the verification code since it's white text in a white input field. As a quick workaround we changed the text color to a shade of gray so it's visible in both contexts but that's not ideal.

Any solutions for this bug? Any plans to fix this by AWS?