The CreateUriForPath(string path) method is summarised as follows
/// Create Uri from a given file path.
/// The file path can be full with prefix or relative without prefix.
/// If null is passed as the path, ArgumentException will be thrown.
Currently the AzureBlob, Azure Data Lake and HDFS implementations of IFileSystem treat the path as relative and appends the baseUri prefix. If a full uri is passed with prefix the returned Uri is incorrect. This needs to be fixed