Potentially, although that poses a different quandary as why did you warp to the bridge then? Unless I'm misunderstanding the reason the warp happens, logically, that warp wouldn't exist b/c of map glitch.
I don't think it's b/c of map glitch, I believe it's b/c of Epona, though map glitch might have something to do with it. For safety, I'd be off Epona without map glitch active to ensure the run continues.
Here's why I don't believe it's map glitch (MG).
OP states you're "hovering in midair". Thus (example from Skyward Sword) you could not have landed on the hitbox (as is possible to glitch into in Skyward Sword, with Skyloft's main island; you can get knocked airborne and be in a state such that you do not trigger entering Skyloft and simply land on the island's hitbox) of the below area of the bridge; you would have landed and thus either slid or stood in place, both of which have different animations.
Update post states that you believe Link is at the trigger (or close to it) whereupon the CS for Lake Hylia would normally play. Problem is, you were on Epona and never "got off" Epona, so I believe the game wants to load Epona with you, which it can't do in Lake Hylia and thus crashes (as with taking Epona into Castle Town)
For some reason I'm not familiar with, you warped to Lake Hylia, despite having MG. It's certainly possible the bridge burning CS trigger is *extremely* large, thus causing the warp (CS triggers aren't always disabled with MG, example being Bublin Fortress right before AG- you MG and hit the gate trigger which sends you into the KB3 trigger., warping you above ground) and if that's the case, you might be on the bridge with no trigger at all, unless the skipped CS counts as a reload, which is logical. The only thing is if the area's never reloaded you're still in effects of MG which means the trigger below the bridge to advance wouldn't exist, and you'd either fall forever or hit the area's bottom, if it exists. B/c you're hovering forever, that indicates you've hit something but haven't landed-which must mean the trigger is not only there but active, thus you aren't in MG anymore (and the CS indeed does reload the area) and thus the only problem can be Epona.
Of course, this is a video game, and applying logic to glitches isn't always the best course of action, however, glitches such as these seem to follow an inherent base pattern which has harder rules than most of the game, thus enabling logic to be a potential attack method.
TL;DR: I believe it's Epona still, but as with before, I might be wrong. I might be made to look like a fool. But my understanding of the glitches at work and the game suggests it is Epona.