Bug in product categories

Hello MultilingualPress team

Thank you for a great plugin! I’ve used it for many years and never ran into a bug, this is the first time I do.

In the latest version there is a bug in WooCommerce product category archive pages.

Summary:

• On normal WordPress pages and single product pages, the site locale is correct.
• On WooCommerce product category archive pages only, the locale sometimes ends up wrong.
• In our case, the Finnish site starts rendering German strings on product category archives, for example:
  • WooCommerce sorting labels
  • stock/status labels
  • Astra shop loop stock badge text
• Disabling MultilingualPress immediately makes the problem disappear.
• The issue is not theme-specific. I tested with another theme as well and the same archive-only locale problem remained.

What I observed:

• The current site/blog is correct.
• The category itself is also assigned to the correct Finnish site.
• The problem appears only in the archive context, not on product pages or regular pages.
• It looks like MultilingualPress is switching site/locale during archive translation handling and not restoring it correctly for product_cat archive requests.

Relevant MultilingualPress code paths:

• src/framework/WordpressContext.php
• src/framework/SwitchSiteTrait.php
• src/multilingualpress/Translator/TermTranslator.php

The important behavior seems to be:

• WordPressContext classifies category/taxonomy requests as term archives.
• TermTranslator::translationFor() switches to the remote site.
• SwitchSiteTrait::updateLocaleToMatchSite() calls switch_to_locale($siteLocale).
• On product category archives, that locale appears to leak into the rest of the request, so WooCommerce labels are rendered in the wrong language.

Workaround that fixed it for us:

• We added a small theme-level workaround that forces the correct locale on is_product_category() requests.
• With that workaround in place, the issue disappears immediately.

So I think the bug is specifically in the term/archive locale switching flow for WooCommerce product category archives. It also happens with different themes and different sites.

Thanks.