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website
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Multiple but as of rn deluxechat.
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Yes
The version on deluxechat that the API says is the latest does not exist as it has been removed,
I have seen this problem for multiple plugins but can only remember one.
https://www.spigotmc.org/resources/deluxechat.1277/history
https://api.spigotmc.org/legacy/update.php?resource=66284/
I have also noticed it can take over 48h for versions so it does not grab them live.