ok, so I don't know if this is a known bug, but if you have other mods/plugins installed, that can break an entire tree by just breaking on block (example: Mekanism's Atomic Disassembler), it just spams particles everywhere and caused a crash/lags of the server I play on.

This is the 1.16.5 version btw.

Send the crash report from the Minecraft folder /crash-reports.

If you or anyone else is able to provide a crash/logs for this please do comment.