Thanks for the reply! Is there maybe a way to recognize which file "contains" the effect defined as "Vfx Cyberspace spawn" then? We couldn't find it in effects.xtbl (stored inside misc_tables.vpp_pc), since the only effect coming close to the one mentioned in mission script was "VFX_CyberSpace_Spawn" (with underscores). However, executing this:
effect_play_on_human( "VFX_CyberSpace_Spawn", LOCAL_PLAYER)
returned nothing as well.