Process completed with exit code 1.

Cannot convert null literal to non-nullable reference type.

Possible null reference return.

Nullability of reference types in type of parameter 'x' of 'int EntityDepthComparer.Compare(IEntity x, IEntity y)' doesn't match implicitly implemented member 'int IComparer<IEntity>.Compare(IEntity? x, IEntity? y)' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'y' of 'int EntityDepthComparer.Compare(IEntity x, IEntity y)' doesn't match implicitly implemented member 'int IComparer<IEntity>.Compare(IEntity? x, IEntity? y)' (possibly because of nullability attributes).

Nullability of reference types in return type of 'IEntity? Entity.Parent.get' doesn't match implicitly implemented member 'IEntity IEntity.Parent.get' (possibly because of nullability attributes).

Nullability of reference types in return type of 'WorldEntity? ObjectEntity.WorldEntity.get' doesn't match implicitly implemented member 'WorldEntity IObjectEntity.WorldEntity.get' (possibly because of nullability attributes).

Nullability of type of parameter 'value' doesn't match overridden member (possibly because of nullability attributes).

Dereference of a possibly null reference.

Possible null reference return.