Native Python Function not returning correct result

Describe the bug

I have written a native Python function, but it does not appear to be returning the expected value. Instead, it just returns its input

To Reproduce Steps to reproduce the behavior:

I have a file native_function.py which contains:

from semantic_kernel.skill_definition import sk_function


class PythonGroundingSkill:
    @sk_function(
        description="Extract contents of <json_block> tags",
        name="ParseJsonBlock",
    )
    def extract_json_block_from_text(self, text: str):
        start_tag = "<json_block>"
        end_tag = "</json_block>"
        i_0 = text.find(start_tag) + len(start_tag)
        i_1 = text.find(end_tag)

        extracted_text = text[i_0:i_1]
        print(f"=~=~=~=\n{extracted_text}\n=~=~=~=\n")

        return extracted_text

I then call it through the following file:

import semantic_kernel as sk
from semantic_kernel.connectors.ai.open_ai import AzureTextCompletion, OpenAITextCompletion

kernel = sk.Kernel()

useAzureOpenAI = True

# Configure AI service used by the kernel
if useAzureOpenAI:
    deployment, api_key, endpoint = sk.azure_openai_settings_from_dot_env()
    kernel.add_text_completion_service("dv", AzureTextCompletion(deployment, endpoint, api_key))
else:
    api_key, org_id = sk.openai_settings_from_dot_env()
    kernel.add_text_completion_service("dv", OpenAITextCompletion("text-davinci-003", api_key, org_id))

skills_directory = "../../skills"
groundingNativeFunctions = kernel.import_native_skill_from_directory(skills_directory, "GroundingSkill")


jsonblock_fetch = groundingNativeFunctions["ParseJsonBlock"]

function_result = jsonblock_fetch("something <json_block>[0, 1]</json_block> something else")

print(function_result.result)

I get output

=~=~=~=
[0, 1]
=~=~=~=

something <json_block>[0, 1]</json_block> something else

So internally, the function is doing the right thing (as seen from the =~=~ bits), but the returned value was the original string, not the return value of the function defined.

Expected behavior

If I return a value from a function, I would like to receive that value back.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Win11 / Python 3.11
• IDE: [e.g. Visual Studio, VS Code]
• NuGet Package Version [e.g. 0.1.0]

Additional context

Name: semantic-kernel
Version: 0.2.7.dev0
Summary:
Home-page:
Author: Microsoft
Author-email: [e-mail]

[evchaki]

@mkarle can you take a look at this.

[dluc]

Team triage: improve function signature detection