Doesn’t 4.19 replace Simplygon completely? Release notes say:
“The new Proxy LOD system is an experimental Plugin for producing low poly LOD with baked materials for multiple meshes. The new system is used by HLOD and is a replacement for Simplygon.”
But if it doesn’t work with skeletal, then it could be a deal breaker for 4.19 - no skeletal LODs and no Simplygon…