You can create a new Custom Field that when an issue changes from 'Bug' to 'New Featura' put a value in custom field (ex. 'Yes') (you can do these with custom listener).
So, you'll have more easy to make the condition of groovy, because you've only have to check on the condition if the custom field is set to 'yes'.
Hope it helps.
i am not getting exactly what do you want achive!!
can you explain little bit more about your requirement.
check this it may help you
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