[17:12:43 INFO]: Deyan21[/ip] logged in with entity id 29 at ([world]-109.94146152794933, 134.58665529011617, 97.31771076883444)
[17:12:43 INFO]: Deyan21 lost connection: Internal Exception: io.netty.handler.codec.EncoderException: Failed to encode packet 'clientbound/minecraft:set_objective'
[17:12:43 INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, name=PROD]

Can you please create a protocol dump file using /protocol dump command on your server and send us the contents of the created dump file?

Can you please create a protocol dump file using /protocol dump command on your server and send us the contents of the created dump file?
dump-2024-06-29_18.03.12.txt

Might be SimpleScore but I'm not sure, can you try to remove it and check if it works again and please provide the full error/log if possible.

Might be SimpleScore but I'm not sure, can you try to remove it and check if it works again and please provide the full error/log if possible.

log file:
latest.log

Yes, after I removed simple score the problem was fixed and allowed me to log in, but I need the plugin, should I contact their support?

Yeah looks like something we can't fix and it will need to be addressed by the author(s) of SimpleScore.