Thanks for pointing that out. But it's really odd. I've been trying to update rasterio using conda, but the version remains at v1.1.0. I just tried doing a new install using conda install -c conda-for

Yep - I'm using 1.1.0

I'm using merge with method = 'max' to merge two rasters with identical metadata. When I open the output file and the input files in QGIS, the top part of the output raster is perfectly merged, but th