Solution

Modified the _get_explicit_runner() method in src/robot/running/namespace.py to also check the suite file's keywords when a prefix is used.

Key changes:

• Check suite_file.owner.name before searching libraries/resources
• Added proper None checks for robustness
• Suite keywords checked first, maintaining consistency with unprefixed resolution

Testing

Verified with test case:

*** Test Cases ***
Simple test
    Some keyword    123    
    MySuite.Some keyword    123    

*** Keywords ***
Some keyword
    [Arguments]        ${alpha}
    Log    ${alpha}