pixi-build - package is rebuilt but not reinstalled

[wolfv]

Checks

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

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

Reproducible example

When editing some Rust code in the rust_bindings of the example: https://github.com/ruben-arts/pycon-de-2025/tree/main/src/rust_bindings and running pixi run start the package is rebuilt but not re-installed.

Issue description

The Rust project is properly rebuilt, but it seems that it is not properly re-installed in the prefix (when running pixi run start from the root of the workspace).

Expected behavior

The package should be rebuilt and reinstalled.