publish not working

When I do a npm publish, I get the following error.

npm ERR! path C:\Users\MARTIJ~1.SAL\AppData\Local\Temp\npm-9092-957d58c5\tmp\fromDir-300df059\package.tgz
npm ERR! code EPERM
npm ERR! errno -4048
npm ERR! syscall unlink
npm ERR! Error: EPERM: operation not permitted, unlink 'C:\Users\MARTIJ~1.SAL\AppData\Local\Temp\npm-9092-957d58c5\tmp\fromDir-300df059\package.tgz'
npm ERR!  { [Error: EPERM: operation not permitted, unlink 'C:\Users\MARTIJ~1.SAL\AppData\Local\Temp\npm-9092-957d58c5\tmp\fromDir-300df059\package.tgz']
npm ERR!   cause:
npm ERR!    { Error: EPERM: operation not permitted, unlink 'C:\Users\MARTIJ~1.SAL\AppData\Local\Temp\npm-9092-957d58c5\tmp\fromDir-300df059\package.tgz'
npm ERR!      errno: -4048,
npm ERR!      code: 'EPERM',
npm ERR!      syscall: 'unlink',
npm ERR!      path:
npm ERR!       'C:\\Users\\MARTIJ~1.SAL\\AppData\\Local\\Temp\\npm-9092-957d58c5\\tmp\\fromDir-300df059\\package.tgz' },
npm ERR!   isOperational: true,
npm ERR!   stack:
npm ERR!    'Error: EPERM: operation not permitted, unlink \'C:\\Users\\MARTIJ~1.SAL\\AppData\\Local\\Temp\\npm-9092-957d58c5\\tmp\\fromDir-300df059\\package.tgz\'',
npm ERR!   errno: -4048,
npm ERR!   code: 'EPERM',
npm ERR!   syscall: 'unlink',
npm ERR!   path:
npm ERR!    'C:\\Users\\MARTIJ~1.SAL\\AppData\\Local\\Temp\\npm-9092-957d58c5\\tmp\\fromDir-300df059\\package.tgz' }
npm ERR!
npm ERR! The operation was rejected by your operating system.
npm ERR! It's possible that the file was already in use (by a text editor or antivirus),
npm ERR! or that you lack permissions to access it.
npm ERR!
npm ERR! If you believe this might be a permissions issue, please double-check the
npm ERR! permissions of the file and its containing directories, or try running
npm ERR! the command again as root/Administrator (though this is not recommended).

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\martijn.saly\AppData\Roaming\npm-cache\_logs\2019-08-06T12_54_29_584Z-debug.log

The tempfile mentioned doesn’t exist after the command has completed. The directory is writable and deletable (I mean it’s the temp dir, that’s what it’s for). I can run the command with --dry-run without errors. The error also happens when I run the command as Administrator. And also when I close all other applications.

So there are actually two problems:

  1. The error above
  2. Dry run isn’t a full dry run (it should produce the above error).

I’m on WIndows 10, NodeJS 10.13, NPM 6.4.1