When I chop the tree in Fabric 1.19.2 the trunk gets transparent.

Thanks for posting here. Could you share a log file? If you're using a mod pack, can you send me a link to it?

Might be fixed in 0.17.6, will try to test later. I think it was an incompatibility with some shaders.

I'm pretty sure this is fixed in newer versions of TreeChop. Feel free to reopen if you're still having issues