title: Plotly library not showing markers in 3D scatter plot
body: <p>In the default tutorial provided by plotly, the following produces a nice image, and has markers appearing on the plot (in accordance with <a href="https://plotly.com/python/3d-scatter-plots/#3d-scatter-plot-with-plotly-express" rel="nofollow noreferrer">https://plotly.com/python/3d-scatter-plots/#3d-scatter-plot-with-plotly-express</a>):</p>
  <pre><code>import plotly.graph_objects as go
  import numpy as np
  
  # Helix equation
  t = np.linspace(0, 10, 50)
  x, y, z = np.cos(t), np.sin(t), t
  
  fig = go.Figure(data=[go.Scatter3d(x=x, y=y, z=z,mode='markers')])
  fig.show()
  </code></pre>
  <p>However if I try to plot some random scatter as follows:</p>
  <pre><code>import plotly.graph_objects as go
  import numpy as np
  
  x = np.random.randn(10,1)
  fig = go.Figure(data=[go.Scatter3d(x=x, y=x, z=x,mode='markers')])
  fig.show()
  </code></pre>
  <p>Nothing shows. It is a blank axis with no markers appearing. Would anyone happen to know why?</p>
  <p>I've tried to change dimensions, transpose, variable names etc, but still nothing?</p>