Ugh! That features seems totally broken in Moho 13. Will let the developers know.
Personally, I don't bother with the Freehand tool. For me, it produces too many errors that need to be fixed and edited. Considering all that extra editing, I find drawing with the Add Points tool is more precise, efficient, and arguably faster. Especially when drawing for deforming puppet parts. --- 駄目じゃん！！ポイントの追加ツールを使った方がマシとのこと。 しかもこれ2019/11月のやりとり。