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That sounds familar, i.e. that the original 3750 don't revert but the new E series (and X series too, I believe) can self revert.
There may not be a solution to avoid restarting stack, but if you want to avoid this in the future, depending on how long a power outage you need to cover on the primary power supply, you might try using UPS(s).
BTW, again don't quote me, but I recall why the original 3750s and E series differ in this regard (and others) is because the originals were really marketed more like SMB devices while the E series were "Enterprise" class.