[sdk] Cannot refer to the loop parameter within the grandchild task

[chensun]

Environment

• KFP version:
  Vertex Pipelines

• KFP SDK version:
  1.8.2

Steps to reproduce

Run the following pipeline on Vertex Pipelines:

from kfp import components
from kfp import dsl
import kfp.v2.compiler as compiler
 
@components.create_component_from_func
def print_op(msg: str):
  print(msg)
 
@dsl.pipeline(
    name='pipeline-with-loops-and-conditions',
    pipeline_root=PIPELINE_ROOT,
)
def my_pipeline(text_parameter: str = '[{"p_a": -1, "p_b": ["hello", "world"]}, {"p_a": 2, "p_b": ["nihao", "shijie"]}]'):
  with dsl.ParallelFor(text_parameter) as item:
    with dsl.Condition(item.p_a != "-1"):
      with dsl.ParallelFor(item.p_b) as item_p_b:
        print_op(item_p_b)
          
 
compiler.Compiler().compile(pipeline_func=my_pipeline, 
                            package_path='loops-and-conditions.json')

Expected result

Expect no error

Actual results

Get HTTP 400 error with message:
Component input parameter 'pipelineparam--text_parameter-loop-item' is not defined