Hi, since I am complete beginner with linuxdeploy, for testing and learning purposes I tried packing a simpler app that doesn't use QT, in my case it was Htop 3.3.0. I created a directory with proper structure that was created with make install DESTDIR=/home/user/htop-3.3.0/.
I put all necessary Linuxdeploy executables in a single directory so that it looks like this:

linuxdeploy-plugin-appimage-x86_64.AppImage
linuxdeploy-plugin-appimage-x86_64.AppImage.zsync
linuxdeploy-plugin-qt-x86_64.AppImage
linuxdeploy-plugin-qt-x86_64.AppImage.zsync
linuxdeploy-x86_64.AppImage
linuxdeploy-x86_64.AppImage.zsync

After running
$ ./linuxdeploy-x86_64.AppImage --appdir=/home/user/htop-3.3.0/
I get the following error:
linuxdeploy version 1-alpha (git commit ID 2b73a21), GitHub actions build 260 built on 2024-01-09 16:46:33 UTC terminate called after throwing an instance of 'std::logic_error' what(): subprocess /home/user/LinuxDeploy/linuxdeploy-plugin-appimage-x86_64.AppImage.zsync --plugin-api-version failed with exit code 2

From here I don't know what is happening.