Elevation profile with raster DEM appears shifted

[Djedouas]

What is the bug or the crash?

The elevation profile is wrong, as if the raster layer was shifted by 1/2 pixel in X & Y.

We can see here that we capture the centroids with the same Z value as the DEM pixel, the centroids are correctly placed in the elevation profile graphic, but the DEM line is not.

Examples are with a 25x25m pixel DEM.

Expected profile:

Another observation: sometimes, the DEM elevation profile is like "filled" with the pixel value

Steps to reproduce the issue

1. In DEM raster layer, check elevation surface representation
2. Create a PointZ layer to have references (raster pixels to points and set Z value processings)
3. Create a profile measurement with a tolerance to allow capturing the points

Sample project to reproduce

Sample project and data inside GPKG : dem_elevation_profile.zip

Versions

QGIS 3.34.9 LTR

QGIS master https://github.com/qgis/QGIS/commit/623ceab11d8

Supported QGIS version

• [X] I'm running a supported QGIS version according to the roadmap.

New profile

• [X] I tried with a new QGIS profile

Additional context

No response

[nicolas-forquet]

I'm facing the same issue. Can anyone look at this issue please?