Using Arcane Bone Meal, from Forbidden and Arcanus on trees and tree seeds causes a massive lag spike, after which the tree is grown to full maturity. On occasion also removes the rooty soil from underneath the tree it is used on.
This issue exists on the v1.21 and v1.20 versions of Dynamic Trees.
When the DT Forbidden and Arcanus addon is present, this issue only arises when bone mealing tree seeds, as it causes the bonemeal to act as an enhanced fertilizer when used on trees.