Leaving a carcass overnight is not something I would do by choice, but if it's down to being safe I'd take the risk of the meat spoiling. If I could get to the animal but not have enough time to do the full butchery job, getting the guts out then coming back tomorrow would be a good move.
That's actually what I did with the first deer I ever shot - it was on a slip at dusk, we were camped at the top of the slip, I climbed down and found it (wasn't sure until I touched the furry "rock" under the trees!), guts out, then a rather hairy climb back to the top in the dark, back down and finished the butchery the next morning.
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