Bug#999771: debian-installer: netcfg gives "Invalid passphrase" before asking for one

[Jonas Bygden <debian@bygden.nu>]

Package: debian-installer
Version: Whatever version is in the netinst iso
Severity: normal

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
Trying to install bullseye on a laptop using a USB-drive and preseed provided via http.
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
Boot from USB-drive 
   * What was the outcome of this action?
"Invalid passphrase" 'The WPA/WPA2 PSK passphrase was either too long (more than 64 characters) or too short (less than 8 characters).'
Screenshot: https://bygden.nu/tmp/IMG_6212.jpeg
   * What outcome did you expect instead?
Network to be configured.

Note: This bugreport is submitted using buster (10.11) since I fail to install bullseye because of the problem.
It works as expected using a buster iso.
It does fail with the same message even with a network cable connected and trying to not use the Wireless interface.

-- System Information:
Debian Release: 10.11
  APT prefers oldstable-updates
  APT policy: (500, 'oldstable-updates'), (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.19.0-18-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled