Inconsistent behavior when providing an array of marker sizes in "markers" mode on scatter3D

When an array of marker sizes is provided in "markers" mode in scatter3D, the displayed size of the markers is half the size displayed when a single value is provided instead of an array. For example, if there are two points on a trace and "[20, 20]" is provided, the displayed markers are displayed at exactly the same size as if only "10" were provided.

Additionally, when you provide an array with fewer elements than points the trace have (for example, a trace with 3 points that is given the array "[20, 20]"), the remaining point markers are sized by default to 10. Maybe that's the expected behavior, but in other charts like scatter2D or scatterpolar the remaining points become hidden (size 0), so I thought it was worth mentioning that too.

Codepen: https://codepen.io/neosdkov/pen/abMrpRo

(not related but thank you all for your great work! I've been using plotly for a few months now and it's just amazing!)

Reproduce los casos de ajuste del tamaño de los marcadores de scatter3D del CodePen enlazado: compara un tamaño escalar con un array de tamaños de igual valor y, después, prueba un array más corto que el número de puntos. Sigue el punto de entrada de los marcadores de scatter3D y verifica que los valores del array coincidan con el tamaño escalar y que el comportamiento del array corto sea intencionado y coherente con la expectativa indicada.