platform exec_properties keys with period silently ignored

[bpoland]

Description of the bug:

When defining a platform, it seems that if you specify any exec_properties with a period in the key then it is silently ignored.

This is likely related to parsing for https://bazel.build/extending/exec-groups but if so, it any values that don't match an execution group should cause a failure, the same as if you specify exec_properties on a rule itself, which fails with an error: Tried to set properties for non-existent exec groups

Which category does this issue belong to?

Configurability

What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

With BUILD.bazel containing the below, run bazel aquery //:test_exec_properties --extra_execution_platforms=//:test --output=jsonproto | jq '.actions[].executionInfo'

You will see the first and third exec properties appear but not the second, and there is no error.

platform(
    name = "test",
    exec_properties = {
        "one": "1",
        "two.does.not.appear": "2",
        "but-this-does": "3",
    },
    visibility = ["//visibility:public"],
)

genrule(
    name = "test_exec_properties",
    outs = ["output.txt"],
    cmd = "echo hello world > $@",
)

Which operating system are you running Bazel on?

MacOS 15

What is the output of bazel info release?

release 8.1.0

If bazel info release returns development version or (@non-git), tell us how you built Bazel.

No response

What's the output of git remote get-url origin; git rev-parse HEAD ?

If this is a regression, please try to identify the Bazel commit where the bug was introduced with bazelisk --bisect.

No response

Have you found anything relevant by searching the web?

No response

Any other information, logs, or outputs that you want to share?

No response

[fmeum]

I've run into this before, but I don't see an easy solution: The available exec groups vary between rules and there are valid use cases for specifying platform properties for an exec group that only some rules in the build define.