I started up a game in 40d and have twice gotten the dwarven caravan but haven't seen my liason yet. The game's worldgen parms tweaked to encourage high resource density so I could start 5x5 with all necessary resources and more live megabeasts (my start year was 50) but is otherwise vanilla.
Is this a bug, expected but unusual behavior (re: I'll get a liason eventually), or did I screw something up by changing my parms?
[WORLD_GEN]
[TITLE:HIGH-V SMALL]
[SEED:1112955174]
[HISTORY_SEED:209078890]
[NAME_SEED:314111702]
[DIM:65:65]
[END_YEAR:150]
[BEAST_END_YEAR:50:10]
[REVEAL_ALL_HISTORY:1]
[CULL_HISTORICAL_FIGURES:0]
[ELEVATION:150:400:1600:1600]
[RAINFALL:0:100:1600:1600]
[TEMPERATURE:30:70:200:200]
[DRAINAGE:0:100:800:800]
[VOLCANISM:60:100:1600:1600]
[SAVAGERY:10:100:1600:1600]
[ELEVATION_FREQUENCY:1:1:1:1:1:1]
[RAIN_FREQUENCY:1:1:1:1:1:1]
[DRAINAGE_FREQUENCY:1:1:1:1:1:1]
[TEMPERATURE_FREQUENCY:1:1:1:1:1:1]
[SAVAGERY_FREQUENCY:1:1:1:1:1:1]
[VOLCANISM_FREQUENCY:1:1:1:1:1:1]
[GOOD_SQ_COUNTS:6:63:127]
[EVIL_SQ_COUNTS:25:240:500]
[PEAK_NUMBER_MIN:3]
[OCEAN_EDGE_MIN:0]
[VOLCANO_MIN:30]
[REGION_COUNTS:SWAMP:66:0:0]
[REGION_COUNTS:DESERT:66:0:0]
[REGION_COUNTS:FOREST:264:0:0]
[REGION_COUNTS:MOUNTAINS:528:0:0]
[REGION_COUNTS:OCEAN:0:0:0]
[REGION_COUNTS:GLACIER:0:0:0]
[REGION_COUNTS:TUNDRA:0:0:0]
[REGION_COUNTS:GRASSLAND:528:0:0]
[REGION_COUNTS:HILLS:528:0:0]
[EROSION_CYCLE_COUNT:250]
[RIVER_MINS:150:150]
[PERIODICALLY_ERODE_EXTREMES:1]
[OROGRAPHIC_PRECIPITATION:1]
[SUBREGION_MAX:2750]
[CAVE_MIN_SIZE:5]
[CAVE_MAX_SIZE:20]
[MOUNTAIN_CAVE_MIN:50]
[NON_MOUNTAIN_CAVE_MIN:100]
[ALL_CAVES_VISIBLE:0]
[SHOW_EMBARK_RIVER:2]
[SHOW_EMBARK_POOL:2]
[SHOW_EMBARK_M_POOL:2]
[SHOW_EMBARK_M_PIPE:2]
[SHOW_EMBARK_CHASM:2]
[SHOW_EMBARK_PIT:2]
[SHOW_EMBARK_OTHER:2]
[SHOW_EMBARK_TUNNEL:2]
[TOTAL_CIV_NUMBER:25]
[TOTAL_CIV_POPULATION:20000]
[PLAYABLE_CIVILIZATION_REQUIRED:1]
[ELEVATION_RANGES:0:0:0]
[RAIN_RANGES:528:1056:528]
[DRAINAGE_RANGES:528:1056:528]
[SAVAGERY_RANGES:528:1056:528]
[VOLCANISM_RANGES:0:0:1000]
If you want to try the site yourself use the finder to look for magma pool, underground river, flux, chasm, and other features in 5x5. You may want to move south a bit to include more woods