When a SUDA node feature definition is configured such that the top cell and bottom cell combine to form a minimum depth of less than 1 meter, placing the node results in a 1 meter depth.
A good example is in the bentley sample library. The cells for feature definition sanitary sewer cleanout should result in a minimum depth of 1.89 feet (.57 m). But when placed, the depth is assigned as 3.28 ft (1 meter). This occurs for any node whose 3D cells combine to a minimum depth of less than 3.28 ft (1 meter)