Locale at checkout is always showing "en", but should change

Hey Shopify community!

I’ve been experiencing locale issues on this store https://mimiandaugust.com/

  1. Add any item to your cart

  2. On the cart page, select store pickup

  3. Proceed to checkout

In the form action, I can see that our app is setting the locale as en-GB, however at checkout, the URL always shows locale=en

Here’s the checkout URL: https://mimiandaugust.com/checkouts/c/fa49b8c738daf2f3f93245da9c215f8b/information?discount=+&locale=en&method=pickup

If I test it out using Online Store > Themes > Customize, I see the correct locale loading. Does anyone know why this is happening and how to solve it?

Any input will be appreciated. Thanks in advance!

Hi - Have the exact same issue… did you find the problem ?

Thank you

Having the same issue here too!