Tree Harvester not working properly

[ghost]

Minecraft version: 1.21.4
Modloader: Forge / Fabric
Neo Forge - 21.4.20
Singleplayer

Mod name: Tree Harvester
Mod version: 9.0

Hi,
So, sometimes the Tree Harvester mod works when I'm holding shift (which is how it's supposed to work as far as I know) but sometimes it works when I'm not pressing shift. I haven't changed any settings or controls. It makes it infuriating because I can't predict whether it will want me to press shift or not and have lost a lot of progress by accidentally deleting build.