I am using QGIS 3.18 to do a quick calculation of the population inside a buffered area. The data for the population comes from WorldPop, the file I got is in the form of GeoTIFF. I inserted it as a raster layer. Then, I put some point type geometries in the map and created a 100 km buffer around the point.
I run the Zonal Statistics tool, The Zonal Statistics then created a new layer, with the categories (sum, mean, etc). But the fields are returned empty (null).
The funny thing is if I do this in QGIS 3.10, the zonal statistics works. Exactly the same settings. The only difference, the stats (sum) is entered directly as a column in the buffer layer, and it contains data. Is this a known bug?