Major's comment is one that I have been keeping in my back pocket for a while... and the reason I wrote that initial article.
When considering both Glitches and Glyphs (nice potential article title, that) I feel it is crucial to consider the Super Y Glyphs in particular (
Super Tri,
Super Di,
Super Mono).
The Super Mono (in at least two different orientations) appears in the Legendary ending cinematic. There are no loading glitches affecting that cinematic. It's a Y-glyph with one SI symbol in it. So far, that same glyph has appeared in only a few (key?) areas of the game... and as we all know the Super Tri and Super Di have only appeared on the Magic Wall in D04.
If we chalk disappearing doors, barriers, dumpsters, and even glyphs up to a glitchy engine weighed down by a design kluge and one year development timeline, we are still left with a mystery that appears to have been
intentionally crafted.
Hoho5000 explained (in this
post):
By no means am I an expert, but what you are describing sounds like different permutations of scenery spawning.
If scenery spawning (or a possible Halo 3/ODST equivalent) was implemented on the Magic Wall with a pool of Super Y-Glyphs, we'd intentionally see a different glyph selection on that wall whenever the spawning trigger was activated. Assuming again that disappearances are entirely due to a glitch, we are still left with the question: why did the designers want to show us these exclusive in-game glyphs on this wall, in this plaza, in this district?