Install from git and msgpack package issue

[JOJ0]

This kind of haunts me since a while. I install beets from git and plugins with poetry install. What am I doing wrong in my setup procedure?

echo
echo '#############################'
echo Installing plugins via pyproject extras ...
echo '#############################'
pip install "beets[aura,autobpm,chroma,docs,discogs,embedart,fetchart,lastgenre,lastimport,mpdstats,reflink,replaygain,web]"
echo

echo
echo '#############################'
echo Installing base beets...
echo '#############################'
pip install -e .
echo

Originally I was alw installing from the git directory first and _after_that installing the "extras". I'm now trying to flip that around, but I keep getting a missing msgpack package issue:

$ poe format
Poe => ruff format
Traceback (most recent call last):
 ...
    import msgpack
ModuleNotFoundError: No module named 'msgpack'

I can fix it by a manual pip install msgback of course, but I'd like to understand why this is not installed by my setup procedure. Thanks for any hints! :-)

I'm on a rather current macOS with and Apple Silicon chip. Might have something to do with that?