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Notifications from failed Healing Skill Checks aren't capped in range.
Platform: PC, Steam.
The game's code states that there is a cap to the range at which the Killer can see Loud Noise Notifications, of 64 meters. However, I tested this in game, going on one of the longest maps, Azarov's Resting Place, and having my friend heal himself from the complete other side of the map, and fail Skill Checks on purpose. Despite being super far and certainly more than 64 meters away, I did still get notifications of his failed Skill Checks. Here is video proof of this; https://youtu.be/i0dJ2lp_M5k
Have a Survivor fail healing Skill Checks from very far away from you, you will still get notifications despite exceeding the Notification cap range.
Since this contradicts the game's code, I'm going with the assumption that it is, in fact, a bug.