Compiler Errors in Unity 2021.2.5

I Unity 2021.2.5 I've simple added MapMagic to my scene and am unable to do anything else due to compiler errors due to you setting non-nullable types to null.

Assets\MapMagic\Compatibility\Runtime\MicroSplatOutput.cs(31,52): error CS0037: Cannot convert null to 'TerrainLayer' because it is a non-nullable value type