This small patch seems to work for my datasets. It also passes geoserver tests.
---
a/src/wms/src/main/java/org/geoserver/wms/featureinfo/RasterLayerIdentifier.java
+++
b/src/wms/src/main/java/org/geoserver/wms/featureinfo/RasterLayerIdentifier.java
@@ -268,8 +268,8 @@ public class RasterLayerIdentifier implements
LayerIdentifier<GridCoverage2DRead
// set the requested position in model space for this request
final Coordinate middle =
WMS.pixelToWorld(
- params.getX(),
- params.getY(),
+ params.getX() + .5, // lookup at pixel center
+ params.getY() + .5, // lookup at pixel center
params.getRequestedBounds(),
params.getWidth(),
params.getHeight());
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