Messenger - Facebook Marketplace - Messages Not Showing

I recently placed some items for sale on Facebook Marketplace. On Saturday, I received a notification in Messenger that there were new messages, but when I look in the Marketplace folder, there are no messages listed. It just says "No messages. New messages will appear here." I've tried restarting my phone (iPhone 13) but it doesn't make any difference. All other Messenger chats with other people are working fine. Any idea what the issue could be? (I can actually find the individual Marketplace messages if I do a search for a key word, so it's not like someone sent a message and then deleted it (if that's even possible), but they're just not showing up in the folder.)
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