Steps to reproduce:
Visit Marketplace catalog(s) in Chinese Traditional / Simplified, no other languages were affected as far as I tested
Click on any item
Expected result: It would lead to an item that existed. The language link would be kept as “zh-hant“ or “zh-hans“
Observed result: It leads to a page that “does not exist”. From the URLs of the catalogs (or when the item was being highlighted in the catalog landing page), the Traditional Chinese version used “zh-tw” for the item’s links instead of “zh-hant“, and the Simplified Chinese version used “zh-cn” for the item’s links instead of “zh-hans“.
Workaround: Replace “zh-tw“ with “zh-hant” or “zh-cn” with “zh-hans” in the URL, so it’s https://www.minecraft.net/zh-hant/marketplace/pdp/[creator / uploader]/[content name]/[pack ID] instead of https://www.minecraft.net/zh-tw/marketplace/pdp/[creator / uploader]/[pack name]/[pack ID] for an item in Traditional Chinese.
Video proof (Traditional Chinese)
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