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I have raster dataset that I would like to convert into vector polygons. Raster to polygon conversion works pretty good. But, having problem when I try to merge adjacent polygons using Dissolve function in Geopandas. Gaps inside polygons are automatically filled which I don't want as I want to use those gaps in further analysis. Is there a way to avoid automatically filling gaps? Here is a simple code:

shp = gpd.read_file("file.shp")
shp_dissolved = shp.dissolve(by="VALUE")
shp_dissolved.to_file("dissolved_file.shp")

Input image:

enter image description here

Output image:

enter image description here

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