6.0.0: Usage of maplibre with mapstyle 'carto-positron' lacks street names

Updated plotly from 5.17 to 6.0.0. In that context I switched from scattermapbox to scattermap (maplibre rendering engine), as recommended. Mapstyle is carto-positron.

After doing this, maps on city scale started to show less street labels, see attached screenshots:

scattermapbox; old rendering engine
scattermap; maplibre rendering engine

Code (using maplibre):

fig = go.Figure()
# [...]
fig.update_layout(
            # [...] other properties
            map_style="carto-positron",
            map = dict(
                zoom = 0,
                bounds = bounding_rect,
            ),
        )

Goal: I want to keep the map style, but also have street labels shown as before (without modifying the zoom of the map).

Question: What options do exist to achieve my goal?

Start by reproducing the supplied Python example with Plotly 6.0.0, the maplibre renderer, and the carto-positron style, then compare it with the scattermapbox result and attached screenshots. The issue names no files or tests; done means retaining carto-positron while showing the expected street labels without changing the map zoom.