Setting stage metadata value results in a Ill-formed SdfPath warning message

[dovanbel]

Describe the bug
Setting stage metadata value results in a Ill-formed SdfPath warning message

Steps to reproduce
Steps to reproduce the behavior:

Execute this in maya's python editor:

import maya.cmds as cmds
import mayaUsd.lib as mayaUsdLib

cmds.createNode('mayaUsdProxyShape', skipSelect=True, name="abc")
stage = mayaUsdLib.GetPrim("abc").GetStage()
stage.SetMetadata('metersPerUnit', 1)

Result :

# Warning: Ill-formed SdfPath <>: :1:1: parse error matching struct pxrInternal_v0_25_5__pxrReserved__::Sdf_PathParser::Path

However, my stage metadata actually reflects the correct value.
Why do I get this warning message ?

Specs (if applicable):

• OS & version: Windows 11
• Maya version Maya 2026.3
• Maya USD 0.34.5
• Pixar USD 25.05