[WP 6.7 beta1] Block editor translation issue in sub-directory enabled Multisites

[them.es]

This is a regression as rolling back to the latest stable version fixes the issue.

1. Make sure to test on a Multisite with sub-directories: e.g. (A) localhost (B) localhost/test
2. Change the site languages on both instances to "de_DE" (or any other non-english locale)
3. Upgrade to WordPress 6.7 beta1
4. Install WooCommerce (both instances) - however, this issue can also be reproduced in other plugins as well
5. Insert the "Single Product" block in the block editor (both instances):

<!-- wp:woocommerce/single-product -->
<div class="wp-block-woocommerce-single-product"></div>
<!-- /wp:woocommerce/single-product -->

6. Notice that on the main site "A" the block gets fully translated to German as expected: Suche nach einem Produkt, das angezeigt werden soll and Fertig.
7. Sub site "B" displays the block controls in English: Search for a product to display and Done. General labels and descriptions (probably coming from block.json?) are translated though.

[swissspidy]

This sounds like a regression from #62016 which itself was supposed to fix another regression.

Closing this in favor of #62016