Hello! We find that the union processing tool fails with certain geometries. The error shown is "GEOS geoprocessing error: difference failed.". The check validity tool did not find any errors with the input layer.
The input data used can be downloaded here: https://www.dropbox.com/s/41bwzjpid3ahwxo/isochrone%20issue.7z?dl=0 Is it related to this issue: https://issues.qgis.org/issues/21584 ? Thanks for your support, Nevil
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