Okay i found some horse's when i first started a game and than i tamed one (it took me until night time lol) and then i rode to find a great place for my house and barn for my horse i got off of the horse and than it keep moving to the direction where i found him/her and the direction where he/she was going had a ravines in front of it and he/she fell in the ravines and he/she died.
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Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.