Landscape Crash when Editing Landscape

Crash when using various landscape editing tools.

Error Log

LogLandscape: Warning: Shader TMaterialCHSTLightMapPolicyLQ unknown by landscape thumbnail material, please add to either AllowedShaderTypes or ExcludedShaderTypes

Related

Partial Fix
Enable Edit Layers.

However, it crashes again while editing when using the Flatten tool. Disabling / enabling teh Enable Edit Layers before editing, seems to work too.

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Thanks