Number one.....If a movie delists and reported box office, the movie stays in the filmography forever. If you look at an active StarBond like MCAIN there are many many old movies. If a performer is delisted due to death or inactivity they remain. Look at SCONN or CDIAZ as examples.
Number two...If a movie does not report box office and it was in release it will delist avfter 12 weeks. ALL StarBonds are detached about a week ahead of the delist. However, you can generally assume that there will be no reported box office if there is no reporting after one weekend. This gets hard for newbies, in terms of whether a StarBond will adjust, or which films count. The KaiGee website should help These detachments NEVER reappear in the filmograpy as nature abhors a zero.
Number three...If a movie delists as STV, STC or never going to be released and they appear on the calendar as such, all attached StarBonds are detached and NEVER get reattached.
Number four.....Concept movies.....thiis gets tricky.. ALMOST ALL Concept movies have all of the attached StarBonds detached. (Occasional exception) IFF a Concept movie goes back to Developement, the performers MAY get reattached or others in theiir place. When Concept movies are delisted as dead projects, there are no attached StarBonds and they will obviously never come back..
I hope I have answered you question.