Small objects are not on the surface of receptacles

I loaded the json file generated by procthor in unity according to this method
https://github.com/allenai/ai2thor/issues/1128
but the position of some small objects seems to be wrong, they are not on the surface of receptacles.

The following image is from the 8th scene in the train folder of the procthor 10k dataset. Mugs, laptops and teddy bears are not spawning in the correct locations.