I have a polygon file in qgis3.0 representing global tectonic plates. I have reprojected the original file in WGS84 (EPSG:4326) to PDC Mercator (EPSG:3832) using only the features that are needed.
Because each feature in the polygon crosses the antimeridian, some (selected) have lines cutting through them:
There are probably a number of ways to remove these lines. So far I have tried Simplify and Polygons to Lines to manipulate the nodes but this just causes the outline to become deformed.