Vrmat with multiple materials not rendering properly

[ILS]

Seems like the vrmat material doesn't respect the face ID of the object, just assigns the same material to all face IDs.
Same thing happens on a plain box, so it's not a proxy issue, seems like a material issue.
I have the right material name selected not sure if this is a bug or there is something else I need to do.
I am also getting a strange error, but i'm not sure what it is, seems like a missing parameter.

All the assets are from the Cosmos library.

[hermit.crab]

The VRayVRMatMtl does not contain material id information. Try applying a Multi/Sub-object in which a node for each material in the VRayVRmatMtl is connected.

[ILS]

Maybe I don't know what I'm talking about but to me it seems like it does, there is a list of material IDs in the main material.
Also the preview sphere renders like the multi material, its showing the sub materials when selecting the main "_3DM...." material from the list.
To me this seems more like a bug and not a lack of feature

<Asset renderer="vray" url="/_3DM_Saki_Posed_009_mtl@mtl_12" type="material" layout="">
<plugin>
<vrayplugin name="MtlMulti" type="material" version="0">
<parameters>
<parameter handler="default" label="scene_name" name="scene_name" listType="string" type="list">
<value>
<list>
<entry>_3DM_Saki_Posed_009_mtl</entry>
</list>
</value>
</parameter>
<parameter handler="default" label="wrap_id" name="wrap_id" listType="none" type="bool">
<value>1</value>
</parameter>
<parameter handler="default" label="ids_list" name="ids_list" listType="integer" type="list">
<value>
<list>
<entry>0</entry>
<entry>1</entry>
<entry>2</entry>
<entry>3</entry>
<entry>4</entry>
</list>
</value>
</parameter>
<parameter handler="default" label="mtls_list" name="mtls_list" listType="plugin" type="list">
<value>
<list>
<entry>/Saki_Posed_009_mtl@mtl_13</entry>
<entry>/Stroller_Fabric_mtl@mtl_14</entry>
<entry>/Stroller_Plastic_mtl@mtl_15</entry>
<entry>/Stroller_Chrome_mtl@mtl_16</entry>
<entry>/Stroller_Rubber_mtl@mtl_17</entry>
</list>
</value>
</parameter>
</parameters>
</vrayplugin>
</plugin>
</Asset>

[hermit.crab]

Those IDs are a different matter. Check this thread for more information.

[ILS]

Thanks, i'll follow up on that thread.