Describe the bug

Some cubes appear to be missing in the visualisation of a blockgraph produced by:
[BlockGraph].view_as_html()

Steps to reproduce the behavior

This is in a Google Colab environment, so we install TQEC by adding:
!python -m pip install git+https://github.com/tqec/tqec.git to the first cell.

Taking the example of a CNOT gate from the examples:

from tqec.gallery import cnot 

cnot().view_as_html()

We get the following result:

For a simpler example:

from tqec.computation.block_graph import BlockGraph
from tqec.utils.position import Position3D


def simple_blockgraph() -> BlockGraph:
    g = BlockGraph()
    g.add_cube(Position3D(0, 0, 0), "ZXZ")
    g.add_cube(Position3D(0, 0, 1), "ZXZ")
    g.add_pipe(Position3D(0, 0, 0), Position3D(0, 0, 1))
    return g
simple_blockgraph().view_as_html()

Expected behavior

The CNOT gate should look as it does in the TQEC gallery:

Python dependency versions