Opened the trading GUI while simultaneously opening the inventory. The villager had been selected first but the inventory opened first, and on exiting the inventory, the trading GUI could not be opened;; right-clicking had no effect. Tried relogging, leaving and re-entering simulation distance and resetting the villager's profession (it had not yet been traded with), none of these were successful. Other villagers could be traded with normally, and the bugged villager would still hold out an emerald if an appropriate item held. The villager had been named 'Jimbob' and was in a minecart. Issue occurred on a Bedrock Dedicated Server. Villager bugged for other players as well.
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I experienced the same issue in version 26.0.
While playing on a rental server, I opened both the inventory and the trading GUI simultaneously, after which I could never open that villager's trading GUI again.
Other players who were playing together also became unable to open the trading GUI.
This happened while I was carefully selecting items to trade with a librarian villager. Since nothing worked to open the trading GUI, I ended up killing that villager.
Looking at the versions where this bug has been reported, it seems to be a serious, long-standing bug. I don't understand why it hasn't been fixed yet.
Please fix this urgently.
(This text was translated from Japanese to English using DeepL.)