When trying to join the server this message is being displayed:

I have registered Minecraft and it works with all other servers I've tried. I contacted the server owner, and he suggested a papermc/bukkit incompatibility.

The server log:

Couldn't register custom payload
org.bukkit.plugin.messaging.ChannelNameTooLongException: Attempted to send a Plugin Message to a channel that was too large. The maximum length a channel may be is 32 chars (attempted 35 - 'enchantedtooltips:genenchant_packet)

Could you try this and report back? https://drive.google.com/file/d/1xI0BNIqZ5gSLFPHOC0bNFY54e_ksjqcS/view?usp=drivesdk

This works! Thank you :D