Hey there,
I just installed Forge and WorldEdit. First world I create is a superflat. It was okay until I broke a block, although a bit laggy.
Forge is version 1.15.2-forge-31.1.27
WorldEdit is worldedit-forge-mc1.14.4-7.0.1.
Could this be a version issue?
I tried on another world and both times I crashed with: