value.get_contents_by_identifier in --file-info-callback always return None

[xNoga]

I'm trying out the new --file-info-callback flag since it's exactly what I need.
However, the contents of the files are always None.

Also, when passing the code exactly from the manual, I get an error saying:

File "/usr/local/bin/git-filter-repo", line 2933, in get_contents_by_identifier
    self._cat_file_process.stdin.write(b'contents '+blobhash+b'\n')
TypeError: can't concat int to bytes

This is solved by converting blob_id to a bytestring before passing to value.get_contents_by_identifier, but I'm unsure if this is the reason why contents is always None.

Here's the command I'm running:

git-filter-repo \
    --state-branch _filter_state \
    --source src \
    --target dst \
    --file-info-callback "$(cat file-info-callback.py)" \
    --replace-text replace-text.txt \
    --force \
    --debug \
    --refs main

Any idea what could be causing this?

[xNoga]

Ah, it seems that callback only works without the --source and --target flags. Is this to be expected?

[xNoga]

It also doesn't work with the --state-branch flag.

[xNoga]

I managed to solve my use-case with --blob-callback instead. I don't think --file-info-callback is supposed to work with --state-branch.