Respawn or NPC not visible.

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Last tested in r296

Bug description:

This is kind of a major bug and seems to happen alot and can be very annoying.
After killing monsters within sight, stay in the area, dont leave out of sight. 
When the mobs respawn, they will be visible for a second then disappear and you 
won't be able to see them until you move out of sight of the area and back to 
it, This is one of the bad parts of this bug.

The other part of it is that, the mobs that are invisible to you when they 
respawn will actually start attacking you (aggressive or linking mobs), you 
will not get any combat messages but ur HP will start to lower as you are 
getting hit and the mob(s) will kill you. The mobs are only invisible to the 
person that was in the area at the time of spawn, other players who come within 
sight of you after it's respawn will see a mob actually hitting you. You are 
able to sit down and rest, but you will not be able to log out, or target the 
mob. Only solution we found so far to it is if you run far enough for the mob 
to lose aggro off you.

Thanks for taking the time to read through this, please take a look into it as 
this can ruin general game play. 

Original issue reported on code.google.com by mortium...@gmail.com on 25 May 2011 at 11:46

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u sure about this bug ? i think thats probably because geodata is missing and 
mobs are falling  when they spawn. Try moving and look carefully in the ground 
:D u should see his head or something like that

Original comment by simeon.e...@gmail.com on 26 May 2011 at 4:33

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Nope thats not the case, thats what we thought at first too.

Original comment by mortium...@gmail.com on 26 May 2011 at 6:18

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[deleted comment]

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Test this bug, its true. Second on this bug is, other players see this mob but 
its permantly selfhealing, so other players are not able to kill it. Problem 
with Npc-selfhealing  if loosing interest on Player I have too.

Original comment by mike.wai...@web.de on 27 May 2011 at 4:31

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Bug exist since Rev 288. Problem with Day and night respawn, changed these 
parts back to rev 287. But problem with endless selfhealing and no aggro by 
loosing interest on Player still exist, believe a problem in ai :(

Original comment by mike.wai...@web.de on 31 May 2011 at 2:23

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I also think this might be AI related.
The bug was there before day and night spawn "fix" ( r287 ) so it has to be 
something else.

Original comment by mortium...@gmail.com on 31 May 2011 at 7:32