There is no image for the series 408:

Status response:

{
  "connection": true,
  "serviceLevel": "AVAILABLE_SERVICE",
  "gpsStatus": "VALID",
  "internet": "HIGH",
  "latitude": 50.52263516666667,
  "longitude": 7.629329,
  "tileY": 58,
  "tileX": -141,
  "series": "408",
  "serverTime": 1674046560791,
  "speed": 283,
  "trainType": "ICE",
  "tzn": "ICE8009",
  "wagonClass": "SECOND",
  "connectivity": {
    "currentState": "NO_INFO",
    "nextState": null,
    "remainingTimeSeconds": null
  },
  "bapInstalled": true
}

Thanks to @tomsiewert for telling me that this issue exists.

I was riding the ICE 373 today from Basel to Bern, and somewhere around Liestal, I got this error:

The "next stop" in the rich presence also didn't update after that. (I never noticed it update, besides the timestamp)

After this, I tried to restart the application. However, the application told me to check whether I was connected with the ICE Wifi or not. I was connected, though (I tested it by reloading the site https://iceportal.de):

OS: Windows 10 Pro (Build 19045.2364)
ICE: 373 Basel-Bern (Complete train journey: Berlin-Interlaken)
Date: 02.01.2023