pixi global sync doesn't report on removed package

[Hofer-Julian]

Checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pixi, using pixi --version.

Reproducible example

[envs.python]
channels = ["https://prefix.dev/conda-forge"]
dependencies = { python = "*", numpy = "*"}
exposed = { python = "python" }

pixi global sync
pixi global edit
# remove numpy
pixi global sync

Output of the last command

✔ Environment python was already up-to-date.

Issue description

If I remove a package from an environment, and run pixi global sync it is indeed being removed. However, it claims that the environment was already up-to-date which is not true

Expected behavior

Something like

✔ Removed package numpy in environment python.