Landscape visibility mask cannot be imported/exported

The ability to import/export visibility mask was available in 4.27.

• Create a landscape.
• Create a material:
  • Blend mode: Masked.
  • Landscape Visibility Mask node connected to Opacity Mask.
• Use Sculpt > Visibility tool to create a hole.
• Go to Manage > Import and try to export or import a visibility mask.

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