Missing folder inside zipped file

[pavan288]

I am noticing some erratic behavior with the method public class func zipFiles(paths: [URL], zipFilePath: URL, password: String?, compression: ZipCompression = .DefaultCompression, progress: ((_ progress: Double) -> ())?) throws

My app passes paths to two directories to the paths paramater. ( I have local logs on my side to ensure that both paths are being passed)

Normally, unzipping the file (after uploading to server) on my desktop results in one folder inside which both the passed directories reside.

But occasionally, only one of the directories is present. I have found no way to concretely reproduce the issue yet.
I would appreciate any sort of guidance on why this might be happening.

I'm happy to provide any other details as well.

Thanks,
Pavan