After updating jenkins to 2.324 we encounter a massive issue with the dir step. In our build we have the following:

...
stage {
  deleteDir() // Initially Clean workspace
  checkout scm
  bat 'make'
  dir('build') {
    stash('result')
  }
  deleteDir() // Cleanup workspace
}
...

In previous versions, the last deleteDir() line delete the whole workspace directory with all contents. After update we observe, that instead the "build" directory is removed.