[QGIS-Developer] qgis crashes on 2band byte raster since recent raster optimizations

[Vincent Schut]

Hi all,

since https://github.com/qgis/QGIS/pull/7383 and 
https://github.com/qgis/QGIS/pull/7384 were merged, qgis crashes with a 
segfault when rendering a 2-band byte raster. A sample tif is attached. 
When opening and enabling this raster, qgis immediately crashes.

If you need more info, please let me know. I'm more than happy to debug 
or test things.

Best,
Vincent.
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