Im sorry for a bad rate but it seems it still having some issue w/1.17! i have changed protocollib also to development version, and still the plugin having a stroke when player "{i}" its unfortunate that this best plugin, is having some issue atm hope it'll get fixed soon thanks!
Author's responseJul 25, 2021
posting 1 star review won't fix that issue unfortunately.
And v6.4.3 is indeed working on 1.17 servers (we have both spigot and paper 1.17.1 test server and working on both).
Plugin works fine, but..
When using {i} on empty hand, it returns in chat "Air", with over message "Invalid item".
When seeing inventory (clicking on "My Inventory" in chat) there are 2 armours (and not one)
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