I don't think this is possible. You can NOT trigger field change scripts based on the DBot Modified field.
1. You can probably have a scheduled command that runs every few min to check if a new note has been added to the incident.
2. You can change the way the note is added to investigation. Choosing a Data Collection task would allow you accept the input and still continue other automated steps.
3. You can also choose the Completion notes section while completing manual tasks.
You approach depends on the use case.
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