Some Spells Cant Find a Target

[Thalion]

Description
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So, certain spells that need to find a target (firebrand, IGMS, ILMS, darkbolt {when casted on the floor}) simply do not find targets, and this seems to happen in specific areas; i noticed it mostly in the shadow cordor crypts.

There are not LoS issues, no invisibility, no stealth. the mobs can be in the middle of an open area, and none of these spells will find their target, the only fix i have found for this is to use a direct target spell like chain lightning a few times, and it seems to reset this target finding issue.

Steps to reproduce
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sometimes in some areas, cast several 'find a target' spells (IGMS, firebrand, etc.)

Expected result
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the spells locate a valid target, and seek then damage them.

Actual result
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the spell acts as if nothing was casted, seeking no targets, dealing no damage

Notes
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there are no spell failure messages, save rolls, immunity notifications or VFX, or any form of indication as to why targets cant be found, changing the spot on the ground where i target also has no effect.

i have seen other spells such as mass haste and mass heal in certain areas seem to have a similar issue, where they don't seem to actually cause their effect, and instead fire off and nothing happening.