On multiple occasions today I've had my ghost alert me to a fallen walker inbound just to have it never show up
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My friends and I have found walkers completely immune to all damage except on the head.
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Noticed this as well, and its definitely never been like that before so its not ghost talking about the previous area.
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It happened to me as well, and I did not go to another location I was in the Forge area for a long time and my ghost told me two separate times about it and I waited and nothing came in
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It might be because you've moved from one area to another. In those cases, the event is in the previous area.