I bury the working end into the loose end in order to get a slip knot effect, which grips the toggle very tightly so it doesn't get lost. Burying the loose end in the working end would produce an unlocked eye splice (if fully buried) or a tiny whoopie sling (if in & out buried), neither of which would accomplish my intent.
Note that the loose nub must be secured on its end, either by backsplice as shown or by whipping or melting the fibers. Otherwise that little bury will eventually unravel, with an ugly outcome.
Sorry for the previous ramblings.