fix(Core/Players): Updates visibility of nearby entities around player's viewpoint in case of immediate changing farsight object. (#11520)

Fixes #11322

src/server/game/Spells/SpellEffects.cpp

@@ -2728,6 +2728,8 @@ void Spell::EffectAddFarsight(SpellEffIndex effIndex)
 
     dynObj->SetDuration(duration);
     dynObj->SetCasterViewpoint();
+
+    m_caster->ToPlayer()->UpdateVisibilityForPlayer();
 }
 
 void Spell::EffectUntrainTalents(SpellEffIndex /*effIndex*/)