Custom CRS EPSG2154 (lambert93) with Flutter Map

[BartholomeNiji]

In our project, we need with a Flutter project, Flutter Map to display an Orthophoto tiles as Orthophoto map (with FlutterMap)
for it as our GetTile request is supported on Lambert 93 (EPSG:2154), we need to configure our Flutter Map with a Custom CRS as EPGS:2154, as I did below.

static FM.Proj4Crs epsg2154() {
    P4.Projection.add('EPSG:2154',
        '+proj=lcc +lat_0=46.5 +lon_0=3 +lat_1=49 +lat_2=44 +x_0=700000 +y_0=6600000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs');
    return FM.Proj4Crs.fromFactory(
        code: 'EPSG:2154',
        proj4Projection: P4.Projection.get('EPSG:2154')!,
        resolutions: getResolutions(6005281.2, -378305.81, 22),
        bounds: FM.Bounds<double>(
          Point<double>(-378305.81, 6005281.2),
          Point<double>(1320649.57, 7235612.72),
        ));
  }

for getResolutions function is used example I found :

static List<double> getResolutions(double maxX, double minX, int zoom,
      [double tileSize = 512.0]) {
    double size = (maxX - minX) / tileSize;

    return List<double>.generate(zoom, (int z) => size / pow(2, z));
  }

And in my example, I need to watch only Zoom 13,14,15 from orthophoto, but I did put 22 in my example, because resolutions need an 22 list length resolution.
From my GetCapabilites, I have theses informations :

<ows:Identifier>default028mm</ows:Identifier>
<ows:SupportedCRS>urn:ogc:def:crs:EPSG::2154</ows:SupportedCRS>
            ....
<TileMatrix>
    <ows:Identifier>13</ows:Identifier>
    <ScaleDenominator>625.5518463417094</ScaleDenominator>
    <TopLeftCorner>-3.55975E7 4.89531E7</TopLeftCorner>
    <TileWidth>512</TileWidth>
    <TileHeight>512</TileHeight>
    <MatrixWidth>410798</MatrixWidth>
    <MatrixHeight>478446</MatrixHeight>
</TileMatrix>
<TileMatrix>
    <ows:Identifier>14</ows:Identifier>
    <ScaleDenominator>357.1882143763838</ScaleDenominator>
    <TopLeftCorner>-3.55975E7 4.89531E7</TopLeftCorner>
    <TileWidth>512</TileWidth>
    <TileHeight>512</TileHeight>
    <MatrixWidth>719439</MatrixWidth>
    <MatrixHeight>837913</MatrixHeight>
</TileMatrix>
<TileMatrix>
    <ows:Identifier>15</ows:Identifier>
    <ScaleDenominator>178.5941071881919</ScaleDenominator>
    <TopLeftCorner>-3.55975E7 4.89531E7</TopLeftCorner>
    <TileWidth>512</TileWidth>
    <TileHeight>512</TileHeight>
    <MatrixWidth>1438878</MatrixWidth>
    <MatrixHeight>1675825</MatrixHeight>
</TileMatrix>

My TileLayer is build as below :

TileLayer(
urlTemplate: 'pathToOrtho',
tileProvider: OrthophotoTileProviderWithAuth(
                        token: token
                        context: context,
                      ),
 ),

From TileLayer, TileProver TileCoordinates object, we're getting weird result as : TileCoordinate(58262, -1098754, 19)
Are we missing something ? We need a TileCol and a TileRow for our orthophoto endpoint.