Clerks III (lost original script of film sequel; 2012-2017)
Clerks III is a sequel to director Kevin Smith's 1994 cult classic film Clerks, It was released in September 2022, but however it was cancelled before being revived.
In February of 2017, Kevin Smith announced he'd be producing a Jay and Silent Bob Reboot. In the same announcement, however, he announced Clerks III's cancellation. At the time of the announcement, it was unknown exactly why he'd cancelled the film.
However, in April of 2017, a video surfaced of him calling out Clerks actor Jeff Anderson for being the reason why. Anderson had stated in a previous podcast that he wasn't keen on playing the part of Randal. It took him a while to even be convinced to come onto Clerks II. 
The last word by Smith himself was in February, where he stated that it would be released in 'some way', either by comic book form or releasing the script itself.
The script was read live on August 3rd, 2019, with no one allowed to record and release the live reading. After the live readings concluded, Smith announced that Clerks III would resume production with a new script, it would later be released in 2022.