selectedpoints doesn't work from Plotly.update for scattergl

[bartmichels-akur8]

This is the same bug as #2348:
I cannot set selectedpoints on a scattergl trace when a box selection exists (in v2.35.2)

See the codepen: https://codepen.io/ks_openeye/pen/gvLrxR
It broke in 2.13.0 (still worked in 2.12.0).

[bartmichels-akur8]

Related: When I have an existing selection and call relayout({selections: []}), then plotly_select is fired with:

• in 2.13.0: the previous point selection
• in 2.14.0+: an empty selection

and in both cases, the point selection does not change. The selection boxes and lasso disappear correctly.
Is this by design?
It feels off, because for other selection events, the event data is the selection after the event, not the symmetric difference between the before and after.