LPE object labels do not work on NURBS objects

[flat]

LPE object labels do not work on NURBS objects.
Is there any reason?

Confirmed with V-Ray 5.1 + Maya 2022 +win10
Test scene attached

[hermit.crab]

Thank you for the provided scene. I've reproduced the issue and logged it (internal bug-tracker id: VMAYA-10457) for developer investigation. LPE labels for materials seem to work fine with NURBS objects, so they may be used as a workaround.