Cook fails if Null TOP is inserted between Split and Merge

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Why does placing a Null TOP between Split and Merge TOPs throws an error on cooking of the Merge operator? A bug?

Traceback (most recent call last):
File "<stdin>", line 4, in <module>
File "/opt/hfs20.5.487/houdini/python3.11libs/nodegraphtopui.py", line 634, in cookNode
cookNodes([node], generate_only)
File "/opt/hfs20.5.487/houdini/python3.11libs/nodegraphtopui.py", line 630, in cookNodes
top_nodes[0].cookWorkItems(
File "/opt/hfs20.5.487/houdini/python3.11libs/hou.py", line 89779, in cookWorkItems
return _hou.TopNode_cookWorkItems(self, *args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
hou.OperationFailed: The attempted operation failed.
TOP node 'merge1' failed to cook

Attachments:
null_merge.mp4 (209.9 KB)

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What's interesting is that today it doesn't error out. Go figure. :/
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