No delivery cost shown when Local pickup is selected

Hello,
I’m using Woocommerce with WCFM, and I’ve got this issue :
https://i.ibb.co/N2N5r1k/Captureproblem.png

When a vendor sets their local pickup as free (by entering “0” in their settings), instead of displaying “Free” or “0,00€” on the checkout (and basket) page, it just displays nothing… Which lets the customer think that they actually have to pay the flat rate (3,50€) showed just above.

Is there any way to avoid this confusing situation by showing “0,00€” or a custom text?

Thank you!