I think this is incorrect. A new tweak to the code has hopefully fixed this. For some reason I think that hglib's bundle creation was automatically generating v2 bundles without specifying to do so when I was originally testing, but now I see that it does not, so I just made the code specify it directly.

as entertained in the code, only bundle20 format support

It hits me that there are some other things i did not check and must be.
Maybe @fiendish already did:

Here are the current shortcomings i saw:

It is also deployed on worker02.

After adaptations and adding the requisite cloning step prior to loading, here is a local succesful load (full local swh stack):

Had to package python-sqllitedict (packaged and uploaded to pergamon) as a runtime dependency for it.