Scattergl fill not shown when too many scattergl-traces in plot

A strange bug happens when adding more than 508 scattergl traces to a figure: the fill property is not shown anymore:

n=509

fig = go.Figure()
for i in range(n):
    fig.add_scattergl(
        x=[0,1], y=np.random.random(2), mode='lines',
        showlegend=False
    )
fig.add_scattergl(
    x=[0.1, 0.9, 0.9, 0.1],
    y=[0.2, 0.2, 1.2, 1.2],
    mode='lines', fill='toself', fillcolor='red'
)
fig.update_layout(hovermode='closest')

With n=509, the fill doesn't show (but the line of the trace does), with n=508, the fill shows up.

Reproduce the issue with the provided Python example, comparing 508 and 509 scattergl traces and checking the final trace's fill rendering. Start by tracing the scattergl rendering path used by the figure; done means the red fill remains visible with 509 traces while the existing line and rendering behavior remain intact.