How can I get rid of the wordpress-importer v2?

It might sound strange, but I'd like to work with the old version, at least as long until humanmade/WordPress-Importer#93 (comment) is re-opened and fixed.

For sure I can install the old importer from the repository, but I guess calling importFile magically activates and uses the v2-importer behind the scenes.

  {
    "step": "importFile",
    "file": {
      "resource": "url",
      "url": "https://raw.githubusercontent.com/carstingaxion/gatherpress-demo-data/main/GatherPress-demo-data-2024.xml"
    }
  }

Try it out yourself by calling this playground builder link. You will find 2 events imported, but without dates & times.

Using the old importer, everything works locally, but I'd like to have this working also in playground. How?