@Wylie ******
what it seems now (the more stamps I "collect" images of IS
If you're applying for ANOTHER 60 day covid extension (meaning you're on a 60 day covid extension now and you want another one) they are ADDING the new extension to the expiration date you have
BUT
If you're going from a different extension, (medical, etc) to a covid one it's starting on the date you apply for it NOT being added to your current expiration date