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Reported data set pixel Size (Layer property -> Information -> Pixel Size) are truncated to 9 decimals. When this information is copied in order to create a new raster, it results in a significant shift in the raster for VERY large data sets (up to 30m on the right side of my data set). I imagine that this information is derived from GDAL's geotransform components which is stored as a IEEE-754 64bit number as confirm to me by Even Rouault. Pixel size should be reported with 19 decimal significant figures ('%.19g' C formatting) to keep the original precision of a IEEE-754 64bit number. Layer extent should also be reported using the original decimal number if it is not already the case.

In python, this would be the equivalent of using this: xPixelSize= str(Decimal(geotransform¹).quantize(Decimal("1.0000000000000000000"))) instead of
xPixelSize= str(geotransform¹)