Root bone has incorrect size/length after being added

[adam-cyclones]

The script to import Mixamo FBX animations and add a root bone, the resulting root bone has an unintended length of approximately 30 meters instead of being a very short bone as expected.

I compared your script to that of the original and it seems that the root bone being added but there is a change to its size and rotation.

Affects blender 3.x and 4.x
Use female locomotion pack in blender

its set to 30, which to me comes out as 30 meters, as you can see this is x-ray view of the bones produced after batch import.

The line responsible is:

Mixamo-Root/mixamoroot.py

Line 296 in e05965c

root_bone.tail.y = 30

Expected:
From a YT tut, I expect to see:

I can raise a PR if the current is actually a bug, I don't know the actual expected behavior.