Hole due to vmtkbranchclipper

I am following the tutorial of MappingAndPatching.

After executing the commands for the following operations

Centerlines extraction and branch splitting

Bifurcation reference systems

Surface splitting

When I check out the resulting groups with

vmtksurfaceviewer -ifile "C:\\Users\\W10\\Desktop\\dicom\\trachea_clipped.vtp" -array GroupIds

there is a hole at the intersection of the groups. I tried increasing surface mesh resolution and also smoothing but the hole always there.

I would like to upload the vtp file but uploader does not let me due to extension.

You can upload your dataset somewhere (onedrive, dropbox, google drive, etc.) and post the link here.