Installation script leaves empty font directory

[CubicrootXYZ]

I am trying to install the font with the script as mentioned in the README:

# /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/JetBrains/JetBrainsMono/master/install_manual.sh)"
Installing latest JetBrains Mono fonts...
Checking requirements...
awk... Found
curl... Found
fc-cache... Found
mkdir... Found
mktemp... Found
unlink... Found
unzip... Found
Downloading latest release info: https://api.github.com/repos/JetBrains/JetBrainsMono/releases/latest
Latest fonts version: v2.304
Downloading fonts archive: https://github.com/JetBrains/JetBrainsMono/releases/download/v2.304/JetBrainsMono-2.304.zip
Extracting fonts: /home/XXXXXX/.local/share/fonts
Building fonts cache...
Cleaning up...
Fonts have been installed

But afterwards there are no fonts in the directory and fc-list also does not know them:

# ls -la /home/XXXXXX/.local/share/fonts
total 18
drwxr-xr-x  2 root      root       2 Oct 12 09:47 .
drwx------ 18 cubicroot cubicroot 20 Oct 12 11:59 ..

# fc-list | grep jet

Meta info:

• OS: Ubuntu 24.04.1 LTS