BUG:merge: Fix merging masked & scaled data #1242

Job	Run time
linting	19s
Test latest dependencies	3m 28s
ubuntu-latest \| 3.10 \| rasterio-* \| scipy YES	2m 22s
Docker \| GDAL=3.8.2 \| python=3.10 \| rasterio \| scipy YES	3m 50s
ubuntu-latest \| 3.11 \| rasterio-* \| scipy YES	1m 49s
Docker \| GDAL=3.8.2 \| python=3.11 \| rasterio \| scipy YES	4m 29s
ubuntu-latest \| 3.12 \| rasterio-* \| scipy YES	1m 56s
Docker \| GDAL=3.8.2 \| python=3.12 \| rasterio \| scipy YES	4m 15s
macos-13 \| 3.10 \| rasterio-* \| scipy YES	4m 4s
Docker \| GDAL=3.6.4 \| python=3.10 \| rasterio \| scipy YES	4m 5s
macos-13 \| 3.11 \| rasterio-* \| scipy YES	3m 29s
Docker \| GDAL=3.7.3 \| python=3.10 \| rasterio \| scipy NO	51s
macos-13 \| 3.12 \| rasterio-* \| scipy YES	4m 16s
windows-latest \| 3.10 \| rasterio-* \| scipy YES	4m 29s
windows-latest \| 3.11 \| rasterio-* \| scipy YES	4m 17s
windows-latest \| 3.12 \| rasterio-* \| scipy YES	4m 22s
	52m 21s

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