Import/Export Dynamic VDB utility ignores visibility flag and always sets to true

import a dynamic vdb in Teid designer, the vdb and related models are generated, however, the visibility flags are not taken into account properly: all models have the visible flag enabled in the vdb, however, i expect models with visbile="false" to have the visible flag disabled.
Same goes when we export a Teiid vdb to a vdb xml: the visibilty flags are not taken into account properly.