The bug

Playing on a server and went to the nether to grab soul sand. Switched to spectator mode and found very little, mostly generating near the bottom of the nether, around the great lava ocean. 
Created a new single-player large biome world. Switched to creative mode and went straight to nether. Barely any soul sand again. Generated a new single-player "regular biome" world.  Again, barely and soul sand. 

Soul sand is now harder to find than nether quartz. Wiki says it generates below Y=65.  Possible that's been changed to below Y=35?

Confirmed for all released and pre-released 1.14.1.  Loaded 1.13.2 new world and generation is normal.