How the combination of two albums just sat on a shelf for 10 years is beyond me but that’s what indeed happened.
This was track one of five recorded on September 24, 1965 which featured Charles Tolliver on trumpet. Tracks 6-10 with Lee Morgan and a different bass player were recorded in April of 1966.
In 1975 they finally were released as one by Blue Note called Jacknife.
Appropriately named considering this is what the label had originally done with the work.