Sorry for my English. When I try to move the root node of a trunk or branch, I get an error. The Unity version is 2019.3, but on 2018.2 it was the same. I also don’t get the information in the tree hierarchy window. Does anyone have any advice on how to fix this?

Sounds like what ever software/plug in you using has a compatabilty issue, where it works for one version of unity, but not for another.