Is it a known issue that Geometric Simplification mode set to Planar under reconstruction settings in U20 still create artificial holes everywhere in the model? This makes the model unusable and takes 2x time to fix those holes. Why such unfinished feature was even released and when this finally will be fixed...
With standard mode:
Defect Report 970226
Until this is resolved do not use planarize as it also is not fixable in touchup tools.