Python version mismatch (since switching to bazel MODULE)

[sschnug]

I'm experiencing the following issue and i'm completely lost here.

While the production-setup is a bit more complex including cibuildwheel, i think the following example demonstrates my issue:

MODULE.bzl (excerpt)

    bazel_dep(name = "rules_python", version = "1.5.1")

    # We do want to enforce a local toolchain as we expect this to run in an isolated container provided by cibuildwheel

    # START TOOLCHAIN AUTO REGISTER
    local_runtime_repo = use_repo_rule(
        "@rules_python//python/local_toolchains:repos.bzl",
        "local_runtime_repo",
        # dev_dependency = True, current bazel 8.3.1 doesn't accept it: remove it (although in rules_python docs)
    )

    local_runtime_toolchains_repo = use_repo_rule(
        "@rules_python//python/local_toolchains:repos.bzl",
        "local_runtime_toolchains_repo",
        # dev_dependency = True, current bazel 8.3.1 doesn't accept it: remove it (although in rules_python docs)
    )

    # Step 1: Define the Python runtime
    local_runtime_repo(
        name = "local_python3",
        interpreter_path = "python3",
        on_failure = "fail",
    )

    # Step 2: Create toolchains for the runtimes
    local_runtime_toolchains_repo(
        name = "local_toolchains",
        runtimes = ["local_python3"],
        # TIP: The `target_settings` arg can be used to activate them based on
        # command line flags; see docs below.
    )

    # Step 3: Register the toolchains
    register_toolchains("@local_toolchains//:all", dev_dependency = True) 
    # END TOOLCHAIN AUTO REGISTER

    bazel_dep(name = "pybind11_bazel", version = "2.13.6")
    bazel_dep(name = "pybind11_protobuf", version = "0.0.0-20250210-f02a2b7")

The toolchain registering actually makes a difference as seen in the following output (and 3.10 is working as expected with auto register):

# WITH toolchain auto register
bazelisk run @rules_python//python/bin:python
Python 3.10.12 (main, May 27 2025, 17:12:29) [GCC 11.4.0] on linux

# WITHOUT toolchain auto register
bazelisk run @rules_python//python/bin:python
Python 3.11.13 (main, Jun  9 2025, 18:12:55) [Clang 20.1.4 ] on linux

But now the issue:

BUILD
bazelisk build //tensor-api-lib/wrapper/pytensorlib:_pytensorlib.so

TRAVERSE
cd bazel-bin/tensor-api-lib/wrapper/pytensorlib/

LOAD
python3
Python 3.10.12 (main, May 27 2025, 17:12:29) [GCC 11.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import _pytensorlib.so
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: Python version mismatch: module was compiled for Python 3.12, but the interpreter version is incompatible: 3.10.12 (main, May 27 2025, 17:12:29) [GCC 11.4.0].
>>> 

I never had those problems with an old WORKSPACE setup (and some older versions).
I'm somewhat convinced, that this is the right repository to ask (opposed to rules_python).

Any ideas?
Thanks