Everyone disconnects when a tree is chopped, and no logs fall,

[rose terrace]

When I try to chop a tree, everyone on the server gets disconnected, and no items drop. This worked in singleplayer when I tried earlier.
This is the disconnect message:
https://i.imgur.com/J7vI17G.png
And this is the log:
https://mclo.gs/6xH8LJS

And the debug log, oops

https://mclo.gs/qG0UV9g

[rose terrace]

This is most recent version of the pack, 0.7.14