The other issue I haven't had a problem personally, just some of the players on my server have and yeah it seems restarting mc fixes it. And the crash report is in the environment and it is the full thing you just have to expand it.
Can confirm, I went through and recreated the farm instead of porting and still having the same issue.
Also something else to note is some trees cause more lag than others. Spruce trees tend to have the least amount of lag while oak trees have the most. Keep in mind the lag amplifies when breaking a log that is connected to the leaves of the tree.
Ahhh okay.
Thanks for the image attatchment
Ok so I have some more information, the crash seems to happen when I try starting my iron phoenix farm. I assume it doesn't like linking doors together and causes a memory leak which then crashes the server.