There is a new conference in cryptology that promotes exactly this: CFAIL.
From their 2019 website[0]:
"Do you have insightful and exciting work sitting in a drawer somewhere because it never quite panned out? Are you willing to share your failed approaches so that others can learn from them without having to re-travel the same road? Are you tired of reading papers that pretend the incremental result they happened to achieve was well-motivated and was their goal all along?
We are! That’s why we are founding a new conference: a place for papers that describe instructive failures or not-yet-successes, as they may prefer to be called."
From their 2019 website[0]: "Do you have insightful and exciting work sitting in a drawer somewhere because it never quite panned out? Are you willing to share your failed approaches so that others can learn from them without having to re-travel the same road? Are you tired of reading papers that pretend the incremental result they happened to achieve was well-motivated and was their goal all along?
We are! That’s why we are founding a new conference: a place for papers that describe instructive failures or not-yet-successes, as they may prefer to be called."
[0] https://www.cfail2019.com/