Issue: GroundOverlay bad placement when invalidate map

[Vaxela]

Hi, I'm Lucas, and I'm integrating osmdroid with Jetpack Compose in my project. I've encountered a peculiar issue with ground overlays that I believe is a bug.

Ground Overlay

[ ] Question
[X] Bug
[ ] Improvement
[ ] Build system related
[ ] Performance
[ ] Documentation

Description and/or steps/code to reproduce the problem

The issue doesn't manifest when the zoom level is set to 5 using Mapnik for France. However, on zooming into certain bounding boxes, my ground overlays occasionally do not align with the ground; instead, they appear to float above it.

Initial Setup
I use the zoomToBoundingBox function at the beginning to adjust the map view:
/** * Zoom the map to enclose the specified bounding box, as closely as possible. Must be called * after display layout is complete, or screen dimensions are not known, and will always zoom to * center of zoom level 0.<br> * Suggestion: Check getIntrinsicScreenRect(null).getHeight() &gt; 0 */ public void zoomToBoundingBox(final BoundingBox boundingBox, final boolean animated) { zoomToBoundingBox(boundingBox, animated, 0); }

Fetching and Displaying Overlays
Upon receiving a list of ground overlays from an API call, I process them as follows:
LaunchedEffect(mapOrthomosaicData) { updateOrthomosaicOverlays( mapOrthomosaicData, mapOrthomosaicOverlays, overlayManagerState, mapViewViewModel, ) }

I add these ground overlays to the overlayManager and subsequently invalidate the map to refresh the display:
`fun updateOrthomosaicOverlays(
orthomosaicData: List,
overlays: Map<Int, Overlay>,
overlayManagerState: OverlayManagerState,
mapViewViewModel: MapViewEasyScanViewModel,
) {
val currentOverlays = overlays.keys.toSet()

// Add new overlays
for (ortho in orthomosaicData) {
    if (ortho.id in currentOverlays) continue
    val groundOverlay = GroundOverlay().apply {
        setPosition(
            ortho.corners["topLeft"],
            ortho.corners["topRight"],
            ortho.corners["bottomRight"],
            ortho.corners["bottomLeft"],
        )
        image = ortho.image
    }
    overlayManagerState.overlayManager.add(0, groundOverlay)
    mapViewViewModel.addOrthomosaicOverlay(ortho, groundOverlay)
}
// Remove overlays that are no longer in the data
for (overlay in currentOverlays) {
    if (orthomosaicData.find { it.id == overlay } != null) continue
    overlayManagerState.overlayManager.remove(overlays[overlay])
    mapViewViewModel.removeOrthomosaicOverlay(overlay)
}
overlayManagerState.getMap().invalidate()

}`

Issue
After calling invalidate(), some ground overlays appear to float above the map. This does not happen when manually moving the map with touch; it only occurs when overlays are programmatically updated and the map is invalidated. Temporarily fixing the issue requires a slight zoom adjustment by the user or programmatically, which results in a brief incorrect display of the overlays before correcting itself.

Does anyone have any insights into this issue?

Environment

If it's a bug, version(s) of android this affects:

All

Version of osmdroid the issue relates to:

osmdroidAndroid = "6.1.18"

Zoom in my bounding box waiting that my ground being download :

Problem with one ground overlay:

Good placement :