I've been working with a map with some Borg mobs on it, but some or all of the spawns seem to disappear when I get close while testing out the map. It's typically the drones in alcoves that vanish, especially if I go out of line of sight of them at some point.
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Foundry Mission Database
Check out my Foundry missions:
Standalone - The Great Escape - The Galaxy's Fair - Purity I: Of Denial - Return to Oblivion
Untitled Series - Duritanium Man - The Improbable Bulk - Commander Rihan
This bug also occurs with orions as well when in testing mode only. the workaround is to publish the mission and test it.