I have a grid of polygons as in the figure below;
I need to dissolve the polygons into a single feature. I used the Dissolve tool on QGIS without specifying any dissolve field. The QGIS result is shown below;
In the attribute table, there is only one feature but the feature contains multi-parts. Performing the same operation on ArcMap, I got the result below which is the expected output. Still a single multipart feature but a finer polygon with lesser vertices.
Any idea on why QGIS behaves that way and how to get my expected result with QGIS?
EDIT: A link to the layer. https://drive.google.com/file/d/1FY-bmamtvznPKaUPzBrAvyYOf6q_-4VU/view?usp=sharing