[bug] conan list --graph-context=build-only lists package that's also available in the host context #19366
Description
Describe the bug
TMU the build-only value should filter out packages that are also available in the host context (unlike the build value) according to this comment, but it's not so for onnx package.
Maybe related to using <host_version>? https://github.com/conan-io/conan-center-index/blob/888d9055518d7203c0986f3cbdb2675de83cadc8/recipes/onnx/all/conanfile.py#L102
> conan version version: 2.23.0 conan_path: /Users/kambala/dev/conan/conan-venv/bin/conan python version: 3.13.6 sys_version: 3.13.6 (main, Aug 6 2025, 13:05:20) [Clang 17.0.0 (clang-1700.0.13.3)] sys_executable: /Users/kambala/dev/conan/conan-venv/bin/python3.13 is_frozen: False architecture: x86_64 system version: Darwin Kernel Version 24.6.0: Wed Oct 15 21:12:21 PDT 2025; root:xnu-11417.140.69.703.14~1/RELEASE_X86_64 platform: macOS-15.7.2-x86_64-i386-64bit-Mach-O system: Darwin release: 24.6.0 cpu: i386 How to reproduce it
# assumes that onnx is already in the cache conan graph info --requires onnx/1.16.2 -f json -b never -nr > graph.json conan list --graph graph.json --graph-context=build-only -f json > pkglist.json Expected: pkglist.json is empty
Actual: it contains protobuf and zlib