This is for Tree Harvester
Like another post i saw, the time it takes to mine a tree while shifting is slower, but it just destroys normally
a gif/clip of this happening:
https://giphy.com/gifs/ZKVE26zFyzYJO08NQG

The server mod list is this if that helps:

Corpse
Serene Seasons
Easy Villagers
Simple Storage Network
Advanced Compass
Guard Villagers
Tree Harvester

Thanks for opening the issue and giving the mod a try! This has been fixed in version 7.2 of Tree Harvester.

https://curseforge.com/minecraft/mc-mods/tree-harvester/files