The transitive examples cited for G in Syriac in LS2 result from a combination of scribal error (i.e. ܒܪܝܬܐ instead of ܒܒܪܝܬܐ) and lexicographer's sloppiness. That fire "burns up" something in our language by saying "burns in" in Syriac does not make it transitive. For the supposed p.p. see s.v. spyp adj. On the other hand, the Mandaic examples seem clear.