flatpak-dotnet-generator doesn't create nuget-sources dir

[webwarrior-ws]

flatpak-builder version

1.2.2

Linux distribution and version

Ubuntu 22.04

Affected flatpak-builder tool

dotnet/flatpak-dotnet-generator.py

flatpak-builder tool cli args

No response

Source repository URL

https://github.com/webwarrior-ws/packwallet/tree/flatpak

Flatpak-builder manifest URL

No response

Description

I follow example in readme and run flatpak-dotnet-generator.py for my project. It generates sources.json file, but no nuget-sources directory.
And looking at script itself, --destdir option is only used to write to sources.json.
In the end, I get the following error: error NU1301: The local source '/run/build/PackWallet/nuget-sources' doesn't exist.