Just FYI I've been waiting a week or so to post this because I thought it might possibly be fixed in updates, or perhaps be redundant with other people's questions or preliminary bug reports(?), but when I try to add zoomed-in layers in API v4, via either (for example):

  L.tileLayer('http://b.tile.openstreetmap.org/{z}/{x}/{y}.png', {
    attribution: 'Source: Esri, i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, ',
    maxZoom: 17,
    minZoom: 12
  }).addTo(map);

or within the API initialization itself:

const options = {

            // Required: API key
            key: 'OznecmCq1hd17S4F3e5rtotajmkUBw2D',

            // Put additional console output
            verbose: true,

            // Optional: Initial state of the map
      lat:   48.46,
      lon: -123.31,
      zoom: 11,
      layers: [
        L.tileLayer('http://b.tile.openstreetmap.org/{z}/{x}/{y}.png', {
          minZoom: 12,
          maxZoom: 17,
          attribution: 'Source: Esri, i-cubed, USDA, USGS, AEX, GeoEye, Getmapping, '
        })
      ],
      minZoom: 0,
      maxZoom: 17
}

// Initialize Windy API
windyInit( options, windyAPI => {

... etc ...

then those zoomed-in layers do not get added to the map (or at least are not accessible via the usual zoom buttons) -- whereas the above work fine in v2.3. Am I doing something wrong? -- do these layer additions need to be done differently in API v4?

Thank you all so much!
Justin