Not unusual to happen and in most cases the meat is fine. Of course temperature and shot placement are part of it.
I have done this many times my self without issue. Last light in the mountains and shot was across a valley, last light raining with thick bush, questionable shot, last light bears thick bush, and just straight up couldn’t find it in the dark are some of the reasons we have done so. On mountain hunts in the past we often broken down animals and did part of the recovery that evening and the rest first thing in the morning
It’s just part of the game essentially hunting tough country away from the road. Sometimes you also make the choice to pass on last light opportunities because temperatures or time available won’t allow a next morning recovery
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