Why does valhalla bicycle routing want to swerve into traffic here?

On this routing query, Valhalla makes the odd decision to leave the cycleway and venture out into a major trunk highway: OpenStreetMap

It’s not shorter, and it seems very odd to prefer highway=trunk over a highway=cycleway with bicycle=designated.

The only difference I can see is that a small section of the cycleway has motor_vehicle=destination, for access to a single house, which should clearly be a lot safer constant traffic at maxspeed=70

Is this a tagging issue (happy to learn!), or a routing engine issue?

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/why-does-valhalla-bicycle-routing-want-to-swerve-into-traffic-here/102416