Polylines keep "disappearing"

[Bastindo]

Describe the problem

Some journeys seem to have bad polyline data, meaning they show up on the map only as a dot on the "null island". Most of my check-ins display fine, so this seems to be rather uncommon. This only happens multiple hours or even days after checking in and first occurred about a week ago. I've also had one check-in where the correct polyline reappeared after a while (about a day).

What steps did you take before the issue occurred?

1. Checked in to a journey
   (map looks correct)
2. Waited a few hours or days
   (map broken)

What did you expect to happen?

Journey map should look something like this:

Browser console or error messages (optional)

GET https://traewelling.de/api/v1/polyline/4445002

{
  "data": {
    "type": "FeatureCollection",
    "features": [
      {
        "type": "Feature",
        "geometry": {
          "type": "LineString",
          "coordinates": [
            [
              null,
              null
            ],
            [
              null,
              null
            ]
          ]
        },
        "properties": {
          "statusId": 4445002
        }
      }
    ]
  }
}

Any additional hints or information? (optional)

No response