While at first it may seem counterintuitive that dysfunction can lead to function, I assert that it can, maybe even - gasp - be required for improvement to occur. Before I go further, I want to acknowledge I may be misinterpreting the question or even focusing on only one of many possible definitions of what "dysfunction" means.
So I'll begin with a dictionary definition of the word:
1: impaired or abnormal functioning
example: gastrointestinal dysfunction
2: abnormal or unhealthy interpersonal behavior or interaction within a group
example: family dysfunction
How?
Before I read the definitions above
I'm a believer in the idea that growth usually requires experimentation and even mistakes and failure. If you see where I'm going with that, please feel free to save yourself time that could be more valuably spent eating pizza or milking your cat.
After reading the definitions above
"1: impaired or abnormal functioning..."
In this case, I see a few paths from dysfunction to function, including:
Assuming the dysfunction leads to a signal of some kind that can be detected, this "signal" can lead to an interested party in initiating a review, debug, analysis, and/or fix to restore function. For example, in the case of gastrointestinal or other physiologic issues, the body will usually, if not always, present signal(s) (symptoms) that can be interpreted by the affected individual and/or a health care professional. Perhaps it is excessive mouth-farting or spontaneous defecation. Whatever the case, the signal was given and hopefully received, which can lead to actions to restore function.
"2: abnormal or unhealthy interpersonal behavior..."
While the previous definition is more general as in it could apply to many types of entities, alive or inanimate in nature, this one is specific to humans or even animals. I'll focus on humans:
Assuming the person or people receiving or observing the "abnormal or unhealthy" behavior choose to give a signal of some kind to the initiator of the behavior, that initiator then has the opportunity to contemplate their actions and the consequences. Ideally, this contemplation would lead to the "misbehaver" working on ways to change their behavior to better benefit themselves and others in the future.
Finally, a recommendation
This discussion reminds me of a book I recently read called "Antifragile: Things That Gain from Disorder" by Nassim Taleb. https://smile.amazon.com/Antifragile-Things-That-Disorder-Incerto-ebook/dp/B0083DJWGO
Finally finally, your thoughts
I'm super interested in hearing what your thoughts are on this topic? In what ways did you, before reading the definition, interpret this question?