getClosestPoints suddenly failed with MultiBody

[a240160572]

Hey I have created a cubic box via createMultiBody and use getClosestPoints to detect the position of another object in the defined cubic space.

The code works well before but today it returns the closest point between the test object and the last plane I defined for the cubic only.
Does anyone know what could be the problem? Thanks

The result from getCollisionShapeData:

(3, -1, 3, (4.0, 0.04, 4.0), b'', (2.0, 2.0, 2.0), (0.0, 0.0, 0.7071067811865475, 0.7071067811865476))    
(0, 0, 3, (4.0, 0.04, 4.0), b'', (0.0, 0.0, 2.0), (0.0, 0.7071067811865475, 0.0, 0.7071067811865476))
(1751343427, 1852785509, 3, (4.0, 0.04, 4.0), b'', (-2.0, 2.0, 2.0), (0.0, 0.0, 0.7071067811865475, 0.7071067811865476))
(1181183593, 1952672114, 3, (4.0, 0.04, 4.0), b'', (0.0, 4.0, 2.0), (0.0, 0.7071067811865475, 0.0, 0.7071067811865476))
(0, 0, 3, (4.0, 0.04, 4.0), b'', (0.0, 2.0, 4.0), (0.7071067811865475, 0.0, 0.0, 0.7071067811865476))
(1600979052, 1634038369, 3, (4.0, 0.04, 4.0), b'', (0.0, 2.0, 0.0), (0.7071067811865475, 0.0, 0.0, 0.7071067811865476))

There are three planes with strange object id. The multibody construction code works well in my test file:

(5, -1, 3, (4.0, 0.04, 4.0), b'', (2.0, 2.0, 2.0), (0.0, 0.0, 0.7071067811865475, 0.7071067811865476))
(0, 0, 3, (4.0, 0.04, 4.0), b'', (0.0, 0.0, 2.0), (0.0, 0.7071067811865475, 0.0, 0.7071067811865476))
(0, 0, 3, (4.0, 0.04, 4.0), b'', (-2.0, 2.0, 2.0), (0.0, 0.0, 0.7071067811865475, 0.7071067811865476))
(0, 0, 3, (4.0, 0.04, 4.0), b'', (0.0, 4.0, 2.0), (0.0, 0.7071067811865475, 0.0, 0.7071067811865476))
(0, 0, 3, (4.0, 0.04, 4.0), b'', (0.0, 2.0, 4.0), (0.7071067811865475, 0.0, 0.0, 0.7071067811865476))
(0, 0, 3, (4.0, 0.04, 4.0), b'', (0.0, 2.0, 0.0), (0.7071067811865475, 0.0, 0.0, 0.7071067811865476))