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.
I am having issues with being unable to throw tridents. I never realized the other things were related but now that you mention it I never notice my elytra taking damage or having to eat. Haven’t had problems with players falling.
I have problem too on multiple accounts.
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.