python_version_independent: ignore python from other packages too

conda_build/render.py

@@ -410,6 +410,8 @@ def get_upstream_pins(m: MetaData, precs, env):
     if m.python_version_independent and not m.noarch:
         ignore_pkgs_list.append("python")
     ignore_list = utils.ensure_list(m.get_value("build/ignore_run_exports"))
+    if m.python_version_independent and not m.noarch:
+        ignore_list.append("python")
     additional_specs = {}
     for prec in precs:
         if any((prec.name == req.split(" ")[0]) for req in ignore_pkgs_list):

news/gh5654.rst

@@ -0,0 +1,20 @@
+### Enhancements
+
+* Ignore run_exports of python from other packages when building with
+  ``python_version_independent: true`` (#5654).
+
+### Bug fixes
+
+* <news item>
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>

tests/test-recipes/metadata/_python_version_independent/meta.yaml

@@ -13,6 +13,7 @@ build:
 
 requirements:
   build:
+    - cross-python_{{ target_platform }}   # [build_platform != target_platform]
   host:
     - python 3.11.*
     - setuptools