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[BUG] Certain non-empty groups are discarded

See original GitHub issue

In the following model, certain non-empty groups are discarded. Pill1_V2.zip

If you open it up in GLTFViewer and check the console, you’ll see this structure:

However, if I run npx gltfjsx Pill_V2.glb I get this structure:

     <group rotation={[-Math.PI / 2, 0, 0]} scale={100}>
        <group position={[0, 0, 0]}>
          <mesh geometry={nodes.front.geometry} material={nodes.front.material} position={[0, 0, 0]} />
          <mesh geometry={nodes.border.geometry} material={nodes.border.material} position={[0, 0, 0]} />
        </group>
        <mesh geometry={nodes.border_1.geometry} material={nodes.border_1.material} position={[0, 0, 0]} />
        <mesh geometry={nodes.front_1.geometry} material={nodes.front_1.material} position={[0, 0, 0]} />
        <mesh geometry={nodes.circle.geometry} material={materials.mat_pill_circle} position={[0, 0, 0]} />
        <mesh geometry={nodes.front_2.geometry} material={nodes.front_2.material} position={[0, 0, 0]} />
        <mesh geometry={nodes.border_2.geometry} material={nodes.border_2.material} position={[0, 0, 0]} />
      </group>

The center and start groups have been discarded, although end is preserved.

Examining the groups, the only difference I can see is that end has position equal to 1.49011608607807e-10, 0, 0], while center and start have position of [0,0,0].

If I run npx gltfjsx Pill_V2.glb -verbose I get the correct structure:

<group name="Pill1" rotation={[-Math.PI / 2, 0, 0]} scale={100}>
            <group name="end" position={[0, 0, 0]}>
              <mesh name="front" geometry={nodes.front.geometry} material={nodes.front.material} position={[0, 0, 0]} />
              <mesh
                name="border"
                geometry={nodes.border.geometry}
                material={nodes.border.material}
                position={[0, 0, 0]}
              />
            </group>
            <group name="center">
              <mesh
                name="border_1"
                geometry={nodes.border_1.geometry}
                material={nodes.border_1.material}
                position={[0, 0, 0]}
              />
              <mesh
                name="front_1"
                geometry={nodes.front_1.geometry}
                material={nodes.front_1.material}
                position={[0, 0, 0]}
              />
            </group>
            <group name="start">
              <mesh
                name="circle"
                geometry={nodes.circle.geometry}
                material={materials.mat_pill_circle}
                position={[0, 0, 0]}
              />
              <mesh
                name="front_2"
                geometry={nodes.front_2.geometry}
                material={nodes.front_2.material}
                position={[0, 0, 0]}
              />
              <mesh
                name="border_2"
                geometry={nodes.border_2.geometry}
                material={nodes.border_2.material}
                position={[0, 0, 0]}
              />
            </group>
          </group>

However, according to the docs verbose is only supposed to affect empty groups:

--verbose, -v Verbose output w/ names and empty groups

(unrelated: shouldn’t the `position={[0,0,0]} be omitted as well?)