Does it has to be expected topological errors when one runs a geoprocessing tool like those for generalization?
Actually, no, there will not be topological errors!
"The tools ensure that topology is maintained during processing. Topological errors will not be introduced. In cases where simplification would otherwise result in a topology violation, the tools first try to split the geometry into two parts, and simplify them independently. This is a recursive process. The sub-parts may be subsequently split again, and so on. If topology cannot be maintained using this approach, the feature is put in waiting, and revisited after neighboring features have been processed, to see if the topology can then be maintained."
See: How Simplify Line and Simplify Polygon work—ArcGIS Pro | ArcGIS Desktop
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