OK, now that I've got my breath back from reading
Titans #23 - jeez, did Roy drop a bag of flaming dog poop on Didio's front porch or something? - I've remembered I recently came across Teen Titans #53, which is both the origin issue and the breakup issue. (Ironically, it's also the first issue of OTT I ever bought, back in the day.)
It has Guardian and Bumblebee minding the store at OTT HQ, and reading in a big record book of the Titans' first adventure, the one reworked in Year One: the heroes going rogue, the sidekicks joining forces, trading off sidekick/hero matchups, breaking the evil alien influence etc. Roy was a rough fit even then, but the standoffishness was on
Roy's side, according to this:

And it was a much-grown Roy who got to do the honors of disbanding the original Titans.
( Here's how he felt about them all in the end. )I just don't even know what to make of Titans #23, after rereading this issue.
suggested tags - char: bumblebee/karen beecher (does not exist), char: herald/vox/mal duncan, char: harlequin/duela dent, char: flash/kid flash/wally west, char: robin/nightwing/dick grayson, char: speedy/red arrow/roy harper, char: wonder girl/troia/donna troy, char: aqualad/tempest/garth, creator: bob rozakis, creator: juan ortiz (does not exist), group: teen titans, publisher: dc comics, title: teen titans
(would theme: retcon hell be appropriate for this post? I dunno.)