Problem Description

When modifying a keyword's body via the start_user_keyword listener method, changes do not take effect for the current execution of the keyword. The modified behavior only applies when the keyword is called again in subsequent executions. This prevents real-time keyword suppression/dynamic modification during test runs.

Steps to Reproduce

1. Create a listener that modifies keyword definitions in start_user_keyword:
   KeywordSuppresor.py

   class KeywordSuppressor:  
       ROBOT_LISTENER_API_VERSION = 3  
       def __init__(self, kw_name):  
           self.keyword_to_skip = kw_name  
       def start_user_keyword(self, data, implementation, result):
           if data.name == self.keyword_to_skip:
               resource = implementation.owner
               for kw in resource.keywords:
                   if data.name == kw.name:
                       kw.body.clear()
                       kw.body.create_keyword(
                           "Log",
                           [
                               f"ROBOT LISTENER: KeywordSuppressor - the keyword '{kw.name}' is requested to be skipped."
                           ],
                       )

2. Create Testcase and Resource file
   Keyword.resource

   *** Keywords ***
   Resource Keyword1
      Log    Hello Resource Keyword1
   
   Resource Keyword2
      Log    Hello Resource Keyword2
   

   Test.robot

   *** Settings ***
   
   Resource    Keyword.resource
   
   *** Test Cases ***
   Log Hello World1
       Robot Keyword1
       Resource Keyword1
       Robot Keyword2
       Resource Keyword2
   
   Log Hello World2
       Robot Keyword1
       Resource Keyword1
       Robot Keyword2
       Resource Keyword2
   
   Log Hello World3
       Robot Keyword1
       Resource Keyword1
       Robot Keyword2
       Resource Keyword2
   
   
   *** Keywords ***
   Robot Keyword1
       Log    Hello Robot Keyword1
    
   Robot Keyword2
       Log    Hello Robot Keyword2  
   

3. Call
   robot --pythonpath . -b rlog --listener ./xxx/KeywordSuppressor.py:'Resource Keyword1' ./xxx/Test.robot

Expected Behavior

Modifications made in start_user_keyword should immediately affect the current execution of the keyword being processed.

Actual Behavior

Changes only take effect on subsequent calls to the keyword.

Need confirmed if this is intentional design or a limitation of the listener API

Environment

Robotframework 7.1
Python Version 3.9.9