Checkout core fields only work partially

Hello,
I use the latest Booster free on up to date WP + WC with Storefront theme.
In the “Checkout Core Fields” module I only want to change the labels for some of the address fields.
For Billing Address 1 it worked. Billing Address 2 and Shipping Address 2 don’t appear (there is nothing before the change, but I thought the input there should then appear there).
Shipping Address 1 does not change to the input at all and stays as before when I activate “Ship to a different address?” at the checkout.
This is not how it should work, right?
Thanks for your help!