Some weired floater in the extracted mesh

[RenieWell]

Thanks for sharing the great work！
But when I ran the mesh extract for scan 31 and scan 127 I got very weired look, like the following:

The main part of the scan looks great, but there still some floater or redundant plane. Do you have any idea about this?
The environment information is:
tinycudann 1.7
torch 1.13.1+cu117
Ubuntu 22.04.2 LTS
NVIDIA 4090
Driver Version: 525.116.04