How would you feel about an author releasing a prequel to a series you love in the middle of said series?

For example lets say you are reading and really loving a book series by an author and awaiting the next book in this series. only instead of the next book continuing the story, its actually a prequel detailing events that happened prior to the main plot of the series. Maybe it fleshes out certain important characters or historical events in the series.

How would you feel about that?

How would you feel about an author releasing a prequel to a series you love in the middle of said series?
Annoyed because i would be expecting to read what happens next not what already happened before the plot
I would be ok with it. it might help clear up the mystery behind things prior to the plot of the main series
I actually love that, fleshes out more details of this world that i have been enjoying reading about
Other
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How would you feel about an author releasing a prequel to a series you love in the middle of said series?
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