opentopodata: Bounds error for tiled datasets without overlap

With my own server (running the current version 1.4.1 of opentopodata), I see the following problem regarding the EU-DEM dataset:

curl "https://myserver/v1/eudem25m?locations=50.100,8.387"
{
  "results": [
    {
      "elevation": 362.4136962890625, 
      "location": {
        "lat": 50.1, 
        "lng": 8.387
      }
    }
  ], 
  "status": "OK"
}

curl "https://myserver/v1/eudem25m?locations=50.101,8.387"
{
  "error": "Location '50.101,8.387' has latitude outside of raster bounds", 
  "status": "INVALID_REQUEST"
}

curl "https://myserver/v1/eudem25m?locations=50.102,8.387"
{
  "results": [
    {
      "elevation": 362.61474609375, 
      "location": {
        "lat": 50.102, 
        "lng": 8.387
      }
    }
  ], 
  "status": "OK"
}

For some reason, the location 50.101,8.387 seems to trigger this bogus error about the latitude being outside of the raster bounds, although it’s clearly inside of the EU-DEM bounds (and for the two neighboring locations everything seems to be fine).

The error occurs every time I query this location on my own server, but interestingly it does not occur with the public server:

curl "https://api.opentopodata.org/v1/eudem25m?locations=50.101,8.387"             
{
  "results": [
    {
      "elevation": 360.98956298828125, 
      "location": {
        "lat": 50.101, 
        "lng": 8.387
      }
    }
  ], 
  "status": "OK"
}

I assume the difference might be due to a slightly different data setup?

And then, independent of this specific problem, I noticed another small issue that occurs when querying two locations at once:

curl "https://myserver/v1/eudem25m?locations=50.101,8.387|50.102,8.387"  
{
  "error": "Location '50.102,8.387' has latitude outside of raster bounds", 
  "status": "INVALID_REQUEST"
}

As shown above, the latitude 50.101 is the problematic one, but here the error message mentions the other one (50.102). This might be an off-by-one issue in the error diagnostics.