hoglins down run away from warped fungus in any of my worlds that was created in 1.15 or earlier. tested 3 worlds created in or before 1.15 and in non of them the hoglins will run from warped fungus. the do however run in a new 1.16 world.

made a platform on nether ceiling in crimson forest biome and no go. the hoglins just stand ontop of the fungus