listTextureSlots throws exception: document appears to be null

[marwie]

Describe the bug
When calling listTextureSlots or getTextureChannelMask for a texture inside a Transform function I'm getting TypeError: Cannot read properties of null (reading 'getRoot')

To Reproduce

• create a transform
• get textures from document
• call listTextureSlots(mytex) with one of the textures

Expected behavior

Versions:

• Version: 3.1.1
• Environment: node 18

Additional context

invoked like so:

the test glb:
Cube.zip

[marwie]

Fixed by #857 (reply in thread)