Stash and unstash of files within a container generate with kubernetes plugins doesn't keep the files attributes

It is working fine elsewhere (slave not provided with kubernetes) but if we stash file generate within a pod or container, we get the bug

This was working properly with version Kubernetes-plugin 0.10

Here is a simple example of the problem, using the same pod/container.

podTemplate(label: 'example') {
  node("example"){
    stage('checkout'){
      container("jnlp"){
        deleteDir()
        sh "touch A"
        sh "chmod a+x A"
        sh "ls -la"
// File has the executable attribute
        stash name: 'artefact', includes: "A"
        deleteDir()
        unstash 'artefact'
        sh "ls -la" 
// File have lost the executable attribute
      }
    }
  }
}

This example is pretty simple. But we use stash and unstash between pod and container quite a lot to avoid «checkout scm» + configure the code at each step.