Your workflow is not commonly used and tested. The primary use case of a XML clip is to be used in whole, possibly trimmed. I can tell you that technically splitting a XML clip is inefficient—not just the action but also reloading. It creates a lot of duplication of objects. I did a little testing and did not reproduce a problem yet. I suggest a different workflow. Either edit the sub-project or don’t use a sub-project. You can also copy and paste clips between projects.
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