Mangler Squigs are generally oblivious to their surroundings, and the crew's attempts to steer them are nominal at best.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Mangler Squigs must take a Dangerous Terrain test if they move over any of the following types of terrain: Forests, Marshland, Obstacles or Mystical Monuments. If their move would take them into contact with a Building, Impassable Terrain or off a table edge then they must take a Dangerous Terrain test and will stop 1" short of the obstruction.