I have this same issue. I initially created our world in 1.12.2, though it was just a small survival island spawn that I updated to 1.13.X after setting a few things up (using mods to help with creation that wouldn't have made the jump). It's been vanilla ever since. I updated to 1.14.1 or .2 and had no issues, eventually hitting 1.14.4 that it was on until yesterday.
Yesterday after I changed to 1.16 (running the vanilla Minecraft server jar from the official download site) I've started getting this spam in my console log. It doesn't seem to occur around when people are joining, but only when people are online. I'll monitor and pass along anything I notice.
I have this same issue. I initially created our world in 1.12.2, though it was just a small survival island spawn that I updated to 1.13.X after setting a few things up (using mods to help with creation that wouldn't have made the jump). It's been vanilla ever since. I updated to 1.14.1 or .2 and had no issues, eventually hitting 1.14.4 that it was on until yesterday.
Yesterday after I changed to 1.16 (running the vanilla Minecraft server jar from the official download site) I've started getting this spam in my console log. It doesn't seem to occur around when people are joining, but only when people are online. I'll monitor and pass along anything I notice.