Please don’t just say ‘can’t reproduce' I can send whatever files to help you diagnose the problem. I normally host my server on ubuntu over ipv6 and it’s worked great, until the past few updates, where I haven’t even bothered to play, other than spending hours and hours trying to debug the problem.
Edit: it worked that one time, I have not been able to get working again. It works on local network, ipv4 and ipv6. Doesn’t work on wan ipv6, I cannot test ipv4.
I cannot join my server over the internet with online mode on. However it does work on a local network. I tried the above workaround and it didn’t seem to work. It did work a few months ago. As soon as I disabled online mode, it then works over the internet so it is not a firewall issue.
I have this problem too. Server lags really bad for even one person when entering the nether and chunks can take a long time to load. I have Ryzen 5 5800x and 32GB RAM that just runs BDS.
World download https://drive.google.com/file/d/1sref_8AQFVDMbaYUvOqXQSsb64mTZ2Ub/view?usp=drive_link
server properties https://drive.google.com/file/d/1ZggYbDAyKbggEF_PdqMGvm4hn1G7mw67/view?usp=sharing
I am beyond befuddled as it seeems to work intermittently on Windows 2025 server.