INPUT_IS_LIST / OUTPUT_IS_LIST with ExecutionBlocker not working

[stephennilor]

When i try to use the Crystools List of Any node, or my own nodes that implement INPUT_IS_LIST or OUTPUT_IS_LIST i get this error from the ExecutionBlocker when attempting to Block execution (i.e. not execute)

!!! Exception during processing !!! 'ExecutionBlocker' object is not iterable
Traceback (most recent call last):
  File "D:\comfy-guill\ComfyUI\execution.py", line 314, in execute
    output_data, output_ui, has_subgraph = get_output_data(obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb)
  File "D:\comfy-guill\ComfyUI\execution.py", line 219, in get_output_data
    output = merge_result_data(results, obj)
  File "D:\comfy-guill\ComfyUI\execution.py", line 179, in merge_result_data
    output.append([x for o in results for x in o[i]])
  File "D:\comfy-guill\ComfyUI\execution.py", line 179, in <listcomp>
    output.append([x for o in results for x in o[i]])
TypeError: 'ExecutionBlocker' object is not iterable

It seems like somehow one needs to be prepared to receive an ExecutionBlocker object instead of the usual inputs to a node, but I don't know what the best way of doing this is; could you advise how to support this node, because it's super helpful from an API call perspective.

To reproduce it, simply make a branching workflow with a Crystools List of Any after an Execution Blocker and dont execute that pathway (i think)