Hi, The split parts tool creates invalid polygons according to GEOS check validity. This issue seems to have been discussed two years ago https://issues.qgis.org/issues/12799 but it still persists today in master.
To reproduce: 1. Create a memory layer with multipolygon type 2. Add a polygon 3. Split the polygon using split parts 4. Use the vertex tool to move the parts apart, in order to avoid issues with polygon parts sharing an edge or vertex 5. Run check validity Method GEOS returns 1 invalid: {'ERROR_COUNT': 0, 'ERROR_OUTPUT': 'output_bd77440a_35eb_4f60_8273_3e4be16349f1', 'INVALID_COUNT': 1, 'INVALID_OUTPUT': 'output_3e1922d6_dc3d_40e1_a0a3_6becbd5cbeb3', 'VALID_COUNT': 0, 'VALID_OUTPUT': 'output_ba297216_4997_4b0d_accd_b1669ff038a5'} Method QGIS returns 1 valid : {'ERROR_COUNT': 0, 'ERROR_OUTPUT': 'output_9feeaeb9_569b_40e8_9062_ad7bd411472d', 'INVALID_COUNT': 0, 'INVALID_OUTPUT': 'output_b6b99e1e_1bbe_442f_8864_99d334efdf45', 'VALID_COUNT': 1, 'VALID_OUTPUT': 'output_0a7d2f97_4bcc_40c1_806e_ad0ff73bcd05'} The attribute table of GEOS' invalid output layer does not provide any information on the type of error. Should I reopen the ticket? I don't see how this tool can be used without ruining the features. Regards, Anita
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