Unable to solve mixture of Google SDK PyPI and Conda dependencies

[twrightsman-heritable]

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

Commands I ran and their output:

$ pixi shell --environment development
  ⠁ default:linux-aarch6 [00:00:00] resolving google-auth==2.49.2                                                                                                                                                    Error:   × failed to solve the pypi requirements of environment 'default' for platform 'linux-64'
  ├─▶ failed to resolve pypi dependencies
  ╰─▶ Because google-cloud-run==0.16.0 depends on grpcio>=1.75.1,<2.0.0 and grpcio==565.0.0, we can conclude that google-cloud-run==0.16.0 cannot be used.
      And because only google-cloud-run<=0.16.0 is available and you require google-cloud-run>=0.16.0, we can conclude that your requirements are unsatisfiable.
  help: The following PyPI packages have been pinned by the conda solve, and this version may be causing a conflict:
        grpcio==565.0.0
        See https://pixi.sh/latest/concepts/conda_pypi/#pinned-package-conflicts for more information.

pixi.toml/pyproject.toml file that reproduces my issue:

[build-system]
build-backend = "hatchling.build"
requires = ["hatchling >=1.27,<2"]

[project]
name = "some_package"
version = "0.1"
authors = [
    { name = "Travis Wrightsman", email = "travis@heritable.ag" },
]
description = "Some description"
requires-python = ">=3.10"
license = "MIT"
dependencies = [
    "google-cloud-run >=0.16.0,<0.17",
]

[tool.pixi.workspace]
channels = ["conda-forge"]
platforms = ["linux-64", "linux-aarch64"]

[tool.pixi.environments]
default = {features = [], solve-group = "default"}
development = {features = ["development"], solve-group = "default"}

[tool.pixi.feature.development.dependencies]
google-cloud-sdk = "=565"

pixi info output:

System                                                                                                                                                                                                               
------------                                                                                                                                                                                                         
       Pixi version: 0.67.0                                                                                                                                                                                          
        TLS backend: rustls                                                                                                                                                                                          
           Platform: linux-aarch64                                                                                                                                                                                   
   Virtual packages: __unix=0=0                                                                                                                                                                                      
                   : __linux=6.12.74=0                                                                                                                                                                               
                   : __glibc=2.41=0                                                                                                                                                                                  
                   : __archspec=1=aarch64                                                                                                                                                                            
          Cache dir: /home/twrightsman/.cache/rattler/cache                                                                                                                                                          
       Auth storage: /home/twrightsman/.rattler/credentials.json                                                                                                                                                     
   Config locations: No config files found                                                                                                                                                                           
                                                                                                                                                                                                                     
Global                                                                                                                                                                                                               
------------                                                                                                                                                                                                         
            Bin dir: /home/twrightsman/.pixi/bin                                                                                                                                                                     
    Environment dir: /home/twrightsman/.pixi/envs                                                                                                                                                                    
       Manifest dir: /home/twrightsman/.pixi/manifests/pixi-global.toml

Workspace                                                                                                                                                                                                            
------------                                                                                                                                                                                                         
               Name: some_package                                                                                                                                                                                    
            Version: 0.1                                                                                                                                                                                             
      Manifest file: /home/twrightsman/envs/test/pyproject.toml

Environments
------------
        Environment: default
           Features: default
        Solve group: default
           Channels: conda-forge
   Dependency count: 1
       Dependencies: python
  PyPI Dependencies: google-cloud-run
   Target platforms: linux-aarch64, linux-64
    Prefix location: /home/twrightsman/envs/test/.pixi/envs/default

        Environment: development
           Features: development, default
        Solve group: default
           Channels: conda-forge
   Dependency count: 2
       Dependencies: google-cloud-sdk, python
  PyPI Dependencies: google-cloud-run
   Target platforms: linux-64, linux-aarch64
    Prefix location: /home/twrightsman/envs/test/.pixi/envs/development

Issue description

This is a bit confusing for me since the feedstock of google-cloud-sdk doesn't define any requirements on other Google SDK packages, so I don't understand why Pixi is determining grpcio==565.0.0 as a requirement.

The following pixi.toml works as expected:

[workspace]
authors = ["Travis Wrightsman <travis@heritable.ag>"]
channels = ["conda-forge"]
name = "test"
platforms = ["linux-aarch64"]
version = "0.1.0"

[tasks]

[dependencies]
google-cloud-sdk = "=565"
google-cloud-run = "=0.16"

Expected behavior

gcloud CLI available in development environment (not through PyPI, but rather the Conda package).

[twrightsman-heritable]

Note, after reading the linked URL on pinned package conflicts, revising the pyproject.toml with the following solves the immediate issue, but the source of why Pixi determines grpcio==565.0.0 as a requirement is still a mystery to me, as conda-forge only has 1.80.0 so it shouldn't be a pinning issue?

[tool.pixi.feature.development.dependencies]
google-cloud-sdk = "=565"
google-cloud-run = "=0.16"