Adding another XYZ tile layer puts it on top, ignoring ZIndex or layer order.

[geometrikal]

I have a map with a XYZ layer:

<Layer @ref="_satelliteLayer"
               Id="satellite"
               SourceType="SourceType.XYZ"
               Url="https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}"
               Visibility="PageState.ShowWorldImagery"/>

and some more fixed layers after that (heatmap, vector layer etc)

I want to programmatically add another layer. Which I do like this:

_orthomosaicLayer = new Layer()
           {
               Id = $"ortho_{DateTime.Now:O}",
               LayerType = LayerType.Tile,
               SourceType = SourceType.XYZ,
               Url = url,
               ZIndex = 2,
               Visibility = PageState.ShowOrthomosaic
           };
           _mapRef.LayersList.Insert(2, _orthomosaicLayer);
           await _mapRef.UpdateLayer(_orthomosaicLayer);

However, no matter what I set the ZIndex, the new XYZ layer appears on top of everything else. Ive tried:

• setting ZIndex on all layers
• removing all layers and re-adding them in the correct order
• having a single xyz layer and just changing the url

[lolochristen]

I could reproduce your issue and it seems to be a problem of the underlying openlayers js library. I'll tried different settings etc. without success. In my test scenario the library just ignored zIndex of some layers, not all. I could not figure out yet a specific pattern.