Gitify Problem: Gitify 2.0.0-alpha3, MODX3, PHP8: xPDO.php Error: could not load package metadata

I got a problem trying to install MODX Extras with Gitify.
My environment

  • PHP8
  • MODX 3.0.2
  • Gitify 2.0.0-alpha3

It is a fresh installation locally on MacOS (brew).

Gitify modx:install works flawlessly

Gitify package:install --all does not work with Error:

core/vendor/xpdo/xpdo/src/xPDO/xPDO.php : 526) Could not load package metadata for package modx.transport. 
Upgrade your model.
Cannot load Provider to install ace-1.9.3-pl

Part of the .gitify-file

        service_url: ''
        description: 'The official MODX transport provider for 3rd party components.'
            - ace-1.9.3-pl

What I tried so far:

  • changed PHP version from 7.4. to 8.0
  • created new .gitify file with gitify init
  • use e.g. gitify package:install ace

Always the same error. Any experienced the same problem?

This seems to be the same issue as this one on github: