[BUG] NixOS - Missing KDE Plasma version

[kresimirko]

Read the FAQ first

• I have checked the FAQ but the issue is not covered

Description

fastfetch (both 2.55.1 and 2.57.0) won't display KDE Plasma's version (6.5.5) on NixOS (25.11).

Refer to the outputs below.

A friend's NixOS VM's fastfetch output also lacks the expected version.

NixOS version: 25.11 with fastfetch installed from the unstable branch; I tested stable, too (uses 2.55.1)
KDE Plasma version: 6.5.5

Version used

fastfetch 2.57.0 (x86_64)

Bug prevalence

Always

Regression

Not sure

Installation

Package manager

Package manager

nix

Screenshots

Relevant output of fastfetch --config all:

Output of plasmashell --version:

Configuration

Happens with any config.

System information

Only relevant part is this (notice the empty version):

  {
    "type": "DE",
    "result": {
      "processName": "plasmashell",
      "prettyName": "KDE Plasma",
      "version": ""
    },
    "stat": 0.8759979996830225
  },

Features built-in

threads
vulkan
wayland
xcb-randr
xrandr
gio
dconf
dbus
imagemagick7
chafa
zlib
sqlite3
egl
glx
opencl
libpulse
libddcutil
libelf
System yyjson
linux/videodev2
linux/wireless

[CarterLi]

Enable "slowVersionDetection": true should fix the problem.

{
  "type": "de",
  "slowVersionDetection": true
}