There was a dormant problem that was found after a late refactor.
So today I've get the bxtrx work a bit forward as he shows the problem. The problem is about propagating transformations. In fact the transforms did not propagate, only the shape creation. This makes odd effects like applying Undo and then Redo to appear as shapes do translate randomly or even break. Devasted helped me with his advices on transformation work and review the changes done, so hope to behave right.
The first part of the day I've did fix a developer debug tool which exposes in a clean way all NaroCAD document tree. Hopefully will simplify some cases of visual hints do not help.