[C#] For span based properties, is there a reason we return a new empty array when its not in the current version, rather than Array.Empty?

See this line of code 

https://github.com/aeron-io/simple-binary-encoding/blob/master/sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/csharp/CSharpGenerator.java#L1144

is there a reason this doesn't generate returning `Array.Empty<{type}>()`  rather than creating a new Array everytime?