if you connect a form control with a basic method, 
you will receive an ActionEvent as parameter.

to make it work, change your macro, e.g.:

Sub macroBAD(oEvt)
 oModel = oEvt.Source.Model
 oDoc = oModel.getParent.getParent.getParent
 msgbox oModel.Name
 msgbox oDoc.drawpage.getforms().getbyname("Form").getByName("buttonBAD").name
End Sub

Now I also discover it isn't bug :-). Now I'm testing in macro if oDoc IS thisComponent


Sub macroBAD(optional oDoc as object) 'after click on button the atribute oDoc is com.sun.star.awt.ActionEvent
	if IsMissing(oDoc) OR (NOT (oDoc IS thisComponent)) then oDoc=thisComponent 'correct
	msgbox oDoc.drawpage.getforms().getbyname("Form").getByName("buttonBAD").name 'error after run from document
End Sub