You probably just got lucky with worldgen on that one, after reading your post I tried both that and flier in case it was something pathing related, but that doesn't seem to be it. It seem like the smaller the world is the more likely they are to crash the game, so I assumed it had something to do with their overly specific starting biome (tropical forest), but even after broadening both starting biome and supported biomes the same seems to be the case. Anyway I fixed their starvation issues, so when the game actually survives worldgen they do as well. Here are the updated raws.
creature_maorin
[OBJECT:CREATURE]
[CREATURE:MAORIN]
[DESCRIPTION:An upright four armed cat the height of a man, but over twice as massive.]
[NAME:maorin:maorin:maorin]
[CASTE_NAME:maorin:maorin:maorin]
[CREATURE_TILE:'M'][COLOR:3:0:0]
[INTELLIGENT]
[BENIGN]
[EQUIPS]
[CANOPENDOORS]
[PREFSTRING:nobility]
[PREFSTRING:pride]
[BODY:HUMANOID_NECK_4ARMS:2EYES:2EARS:NOSE:2LUNGS:HEART:GUTS:ORGANS:HUMANOID_JOINTS:THROAT:NECK:SPINE:BRAIN:SKULL:4FINGERS:3TOES:MOUTH:TONGUE:FACIAL_FEATURES:GENERIC_TEETH_WITH_LARGE_EYE_TEETH:RIBCAGE]
[BODYGLOSS:CLAW_HAND]
[BODYGLOSS:PAW]
[BODY_DETAIL_PLAN:STANDARD_MATERIALS]
[BODY_DETAIL_PLAN:STANDARD_TISSUES]
[BODY_DETAIL_PLAN:VERTEBRATE_TISSUE_LAYERS:SKIN:FAT:MUSCLE:BONE:CARTILAGE]
[BODY_DETAIL_PLAN:BODY_HAIR_TISSUE_LAYERS:HAIR]
[USE_MATERIAL_TEMPLATE:CLAW:NAIL_TEMPLATE]
[USE_TISSUE_TEMPLATE:CLAW:CLAW_TEMPLATE]
[TISSUE_LAYER:BY_CATEGORY:FINGER:CLAW:FRONT]
[TISSUE_LAYER:BY_CATEGORY:TOE:CLAW:FRONT]
[SELECT_TISSUE_LAYER:HEART:BY_CATEGORY:HEART]
[PLUS_TISSUE_LAYER:SKIN:BY_CATEGORY:THROAT]
[TL_MAJOR_ARTERIES]
[BODY_DETAIL_PLAN:STANDARD_HEAD_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_HEAD_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_RIBCAGE_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_RELSIZES]
[RELSIZE:BY_CATEGORY:CLAW:600]
[USE_MATERIAL_TEMPLATE:SINEW:SINEW_TEMPLATE]
[TENDONS:LOCAL_CREATURE_MAT:SINEW:200]
[LIGAMENTS:LOCAL_CREATURE_MAT:SINEW:200]
[HAS_NERVES]
[USE_MATERIAL_TEMPLATE:BLOOD:BLOOD_TEMPLATE]
[BLOOD:LOCAL_CREATURE_MAT:BLOOD:LIQUID]
[USE_MATERIAL_TEMPLATE:SPIT:SPIT_TEMPLATE]
[CAN_DO_INTERACTION:MATERIAL_EMISSION]
[CDI:ADV_NAME:Spit]
[CDI:USAGE_HINT:NEGATIVE_SOCIAL_RESPONSE]
[CDI:USAGE_HINT:TORMENT]
[CDI:BP_REQUIRED:BY_CATEGORY:MOUTH]
[CDI:MATERIAL:LOCAL_CREATURE_MAT:SPIT:LIQUID_GLOB]
[CDI:VERB:spit:spits:NA]
[CDI:TARGET:C:LINE_OF_SIGHT]
[CDI:TARGET_RANGE:C:15]
[CDI:MAX_TARGET_NUMBER:C:1]
[CDI:WAIT_PERIOD:30]
[CREATURE_CLASS:GENERAL_POISON]
[GETS_WOUND_INFECTIONS]
[GETS_INFECTIONS_FROM_ROT]
[USE_MATERIAL_TEMPLATE:PUS:PUS_TEMPLATE]
[PUS:LOCAL_CREATURE_MAT:PUS:LIQUID]
[SPOUSE_CONVERSION_TARGET]
[PHYS_ATT_RANGE:STRENGTH:700:1200:1400:1500:1600:1800:2500] +
[PHYS_ATT_RANGE:AGILITY:700:1200:1400:1500:1600:1800:2500]
[BODY_SIZE:0:0:6000]
[BODY_SIZE:1:168:45000]
[BODY_SIZE:8:0:180000]
[MAXAGE:250:300]
[ATTACK:SCRATCH:CHILD_TISSUE_LAYER_GROUP:BY_TYPE:GRASP:BY_CATEGORY:FINGER:CLAW]
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:scratch:scratches]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PENETRATION_PERC:100]
[ATTACK_FLAG_EDGE]
[ATTACK_PRIORITY:MAIN]
[ATTACK:PUNCH:BODYPART:BY_TYPE:GRASP]
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:punch:punches]
[ATTACK_CONTACT_PERC:100]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:SECOND]
[ATTACK:KICK:BODYPART:BY_TYPE:STANCE]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:kick:kicks]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PREPARE_AND_RECOVER:4:4]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:SECOND]
[ATTACK_FLAG_BAD_MULTIATTACK]
[ATTACK:BITE:CHILD_BODYPART_GROUP:BY_CATEGORY:HEAD:BY_CATEGORY:TOOTH]
[ATTACK_SKILL:BITE]
[ATTACK_VERB:bite:bites]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PENETRATION_PERC:100]
[ATTACK_FLAG_EDGE]
[ATTACK_PRIORITY:SECOND]
[ATTACK_FLAG_CANLATCH]
[NATURAL_SKILL:GRASP_STRIKE:2]
[NATURAL_SKILL:DODGING:2]
[NATURAL_SKILL:SITUATIONAL_AWARENESS:2]
[APPLY_CREATURE_VARIATION:STANDARD_BIPED_GAITS:900:675:450:225:1900:2900] 39 kph
[APPLY_CREATURE_VARIATION:STANDARD_CLIMBING_GAITS:6561:6115:5683:1755:7456:8567] 5 kph, NO DATA
[APPLY_CREATURE_VARIATION:STANDARD_SWIMMING_GAITS:5341:4723:4112:1254:6433:7900] 7 kph
[APPLY_CREATURE_VARIATION:STANDARD_CRAWLING_GAITS:2990:2257:1525:731:4300:6100] 12 kph, NO DATA
[CASTE:FEMALE]
[FEMALE]
[CASTE:MALE]
[MALE]
[SELECT_CASTE:ALL]
[SET_TL_GROUP:BY_CATEGORY:ALL:HAIR]
[TL_COLOR_MODIFIER:TAUPE_DARK:1:DARK_BROWN:1:SEPIA:1:RAW_UMBER:1]
[TLCM_NOUN:hair:SINGULAR]
[TL_COLOR_MODIFIER:PUPIL_EYE_RED:1:PUPIL_EYE_MAROON:1:PUPIL_EYE_CRIMSON:1:PUPIL_EYE_ORANGE:1]
[TLCM_NOUN:eyes:PLURAL]
entity_maorin
[OBJECT:ENTITY]
[ENTITY:SAVAGE]
[INDIV_CONTROLLABLE]
[CREATURE:MAORIN]
[ADVENTURE_TIER:4]
[BIOME_SUPPORT:ANY_FOREST:1]
[BIOME_SUPPORT:ANY_GRASSLAND:2]
[START_BIOME:ANY_FOREST]
[TRANSLATION:ELF]
[PANTS:ITEM_PANTS_LOINCLOTH:COMMON]
[INSTRUMENT:ITEM_INSTRUMENT_FLUTE]
[INSTRUMENT:ITEM_INSTRUMENT_DRUM]
[CLOTHING]
[EQUIPMENT_IMPROVEMENTS]
[USE_ANIMAL_PRODUCTS]
[OCEAN_PRODUCTS]
[OUTDOOR_FARMING]
[DEFAULT_SITE_TYPE:CITY]
[TOLERATES_SITE:CITY]
[TOLERATES_SITE:TREE_CITY]
[MAX_POP_NUMBER:1000]
[START_GROUP_NUMBER:20]
[SELECT_SYMBOL:WAR:NAME_WAR]
[SUBSELECT_SYMBOL:WAR:VIOLENT]
[SELECT_SYMBOL:BATTLE:NAME_BATTLE]
[SUBSELECT_SYMBOL:BATTLE:VIOLENT]
[SELECT_SYMBOL:SIEGE:NAME_SIEGE]
[SUBSELECT_SYMBOL:SIEGE:VIOLENT]
[SELECT_SYMBOL:ROAD:NAME_ROAD]
[SELECT_SYMBOL:TUNNEL:NAME_TUNNEL]
[SELECT_SYMBOL:BRIDGE:NAME_BRIDGE]
[SELECT_SYMBOL:WALL:NAME_WALL]
[SELECT_SYMBOL:REMAINING:NATURE]
[SELECT_SYMBOL:REMAINING:VIOLENT]
[CULL_SYMBOL:ALL:DOMESTIC]
[CULL_SYMBOL:ALL:SUBORDINATE]
[CULL_SYMBOL:ALL:EVIL]
[CULL_SYMBOL:ALL:NEGATIVE]
[CULL_SYMBOL:ALL:UGLY]
[CULL_SYMBOL:ALL:NEGATOR]
[MAX_STARTING_CIV_NUMBER:1]
[PERMITTED_JOB:WOODCRAFTER]
[PERMITTED_JOB:WEAVER]
[PERMITTED_JOB:CLOTHIER]
[PERMITTED_JOB:HERBALIST]
[RELIGION:PANTHEON]
[RELIGION_SPHERE:WISDOM]
[RELIGION_SPHERE:WAR]
[RELIGION_SPHERE:REBIRTH]
[RELIGION_SPHERE:LOYALTY]
[RELIGION_SPHERE:BALANCE]
[RELIGION_SPHERE:COURAGE]
[RELIGION_SPHERE:FERTILITY]
[ETHIC:KILL_ENTITY_MEMBER:PUNISH_EXILE]
[ETHIC:KILL_NEUTRAL:JUSTIFIED_IF_GOOD_REASON]
[ETHIC:KILL_ENEMY:ACCEPTABLE]
[ETHIC:KILL_ANIMAL:JUSTIFIED_IF_GOOD_REASON]
[ETHIC:KILL_PLANT:JUSTIFIED_IF_NO_REPERCUSSIONS]
[ETHIC:TORTURE_AS_EXAMPLE:MISGUIDED]
[ETHIC:TORTURE_FOR_INFORMATION:MISGUIDED]
[ETHIC:TORTURE_FOR_FUN:MISGUIDED]
[ETHIC:TORTURE_ANIMALS:SHUN]
[ETHIC:TREASON:PUNISH_EXILE]
[ETHIC:OATH_BREAKING:PUNISH_EXILE]
[ETHIC:LYING:MISGUIDED]
[ETHIC:VANDALISM:PUNISH_REPRIMAND]
[ETHIC:TRESPASSING:PUNISH_REPRIMAND]
[ETHIC:THEFT:PUNISH_EXILE]
[ETHIC:ASSAULT:PUNISH_EXILE]
[ETHIC:SLAVERY:PUNISH_EXILE]
[ETHIC:EAT_SAPIENT_OTHER:APPALLING]
[ETHIC:EAT_SAPIENT_KILL:SHUN]
[ETHIC:MAKE_TROPHY_SAME_RACE:APPALLING]
[ETHIC:MAKE_TROPHY_SAPIENT:MISGUIDED]
[ETHIC:MAKE_TROPHY_ANIMAL:PERSONAL_MATTER]
[WANDERER]
[MERCENARY]
[AMBUSHER]
[POSITION:CHIEFTAIN]
[NAME_MALE:chieftain:chieftesses]
[NAME_FEMALE:chieftess:chieftains]
[NUMBER:1]
[RESPONSIBILITY:LAW_MAKING]
[RESPONSIBILITY:RECEIVE_DIPLOMATS]
[RESPONSIBILITY:MILITARY_GOALS]
[RESPONSIBILITY:MILITARY_STRATEGY]
[MENIAL_WORK_EXEMPTION]
[PRECEDENCE:1]
[FLASHES]
[BRAG_ON_KILL]
[CHAT_WORTHY]
[DO_NOT_CULL]
[KILL_QUEST]
[EXPORTED_IN_LEGENDS]
[COLOR:7:0:1]
[DUTY_BOUND]
[POSITION:SHAMAN]
[NAME:shaman:shamans]
[NUMBER:1]
[RESPONSIBILITY:RELIGION]
[MENIAL_WORK_EXEMPTION]
[PUNISHMENT_EXEMPTION]
[PRECEDENCE:1]
[FLASHES]
[BRAG_ON_KILL]
[CHAT_WORTHY]
[DO_NOT_CULL]
[KILL_QUEST]
[EXPORTED_IN_LEGENDS]
[COLOR:2:0:1]
[DUTY_BOUND]