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I was just looking through AVENGERS ANNUAL 14 (1985), scripted by Roger Stern, wi/h pencils by John Byrne/ Kyle Baker inks. I love this annual, because the Avengers and FF visit a space station, and in a night club on the base, the club owner is visibly Humphrey Bogart's character from Casablanca,. And to a certain extent the plot follows the themes of that classic movie, amid the aftermath of a galactic battle between the Skrulls and their imperial galactic opposition. Where a fight is between the two warring sides both there to take leave from the war,a clash between the two sides begins to erupt in the club, and "Bogey" steps out of the crowd in a white tuxedo and, riffing his movie role, says he doesn't allow that kind of rough play in his club.
https://readallcomics.com/avengers-v1-annual-014/

Looking at that issue's Bullpen Bulletins checklist of other issues published the same month, this annual was published on the tail end of AVENGERS 259-260, a new continuation of the Kree-skrull war (back in AVENGERS 93-97).
https://readallcomics.com/avengers-v1-259/
https://readallcomics.com/avengers-v1-260/

And out one issue before Byrne's short six-issue run on INCREDIBLE HULK 314-319 began.
https://readallcomics.com/incredible-hulk-v1-314/

And the same month as FF 284, toward the end of Byrne's classic run in 232-296.
https://readallcomics.com/fantastic-four-v1-284/

And the same month as EPIC ILLUSTRATED 32, with "The Last Galacus Story" by Byrne/Austin, famously left unfinished by Byrne, in issues 26-34
https://readallcomics.com/epic-illustrated-32/

And the same month as Marvel Graphic Novel 18, SHE-HULK by Byrne
https://readallcomics.com/marvel-graphic-novel-issue-18-the-sensational-she-hulk/


All of which shows Byrne still in his heyday at Marvel, about the time he announced he would be doing Superman for DC.

And then suddenly was treated badly by Marvel editors, to the point he abruptly quit all these series, and what had been on Byrne's part intended as a friendly temporary departure from Marvel to work on Superman, compelled Byrne to very publicly and suddenly leave Marvel in disgust on the harshest of terms, leaving many of these series unfinished.
How quickly he went from being a cornerstone at Marvel in work he clearly loved for many years, to feeling compelled to immediately leave because it suddenly became unendurable, so insultingly bad was Marvel's new treatment of him.