why property 'get'/'set' method can't override independ

[WhiteSmoogy]

abstract class Cplusplus
{
	public abstract int Version {get;}
}

class CSharp :Cplusplus
{
public int Version {override get;set;}
}

compier error:
Compilation error (line 10, col 39): The modifier 'override' is not valid for this item
Compilation error (line 10, col 43): 'CSharp.Version.set': cannot override because 'Cplusplus.Version' does not have an overridable set accessor

but

public interface Java
{
	int Version {get;}
}

class JavaScript :Java
{
public int Version {get;set;}
}

compiled success.

[TahirAhmadov]

#1568