BUG:merge: Fix merging masked & scaled data (#817) #1244

Job	Run time
linting	11s
Docker \| GDAL=3.8.2 \| python=3.10 \| rasterio \| scipy YES	3m 37s
Test latest dependencies	3m 21s
Docker \| GDAL=3.8.2 \| python=3.11 \| rasterio \| scipy YES	3m 53s
Docker \| GDAL=3.8.2 \| python=3.12 \| rasterio \| scipy YES	11m 5s
ubuntu-latest \| 3.10 \| rasterio-* \| scipy YES	2m 19s
ubuntu-latest \| 3.11 \| rasterio-* \| scipy YES	1m 57s
Docker \| GDAL=3.6.4 \| python=3.10 \| rasterio==1.3 \| scipy YES	2m 38s
Docker \| GDAL=3.7.3 \| python=3.10 \| rasterio \| scipy NO	10m 44s
ubuntu-latest \| 3.12 \| rasterio-* \| scipy YES	1m 58s
macos-13 \| 3.10 \| rasterio-* \| scipy YES	5m 11s
macos-13 \| 3.11 \| rasterio-* \| scipy YES	3m 57s
macos-13 \| 3.12 \| rasterio-* \| scipy YES	3m 49s
windows-latest \| 3.10 \| rasterio-* \| scipy YES	5m 3s
windows-latest \| 3.11 \| rasterio-* \| scipy YES	4m 51s
windows-latest \| 3.12 \| rasterio-* \| scipy YES	5m 2s
	1h 9m 36s

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