Last I used Visidata, it didn't play nice with fields like %sort (they'd disappear if you re-saved the file) and if you had two fields with the same name in one record they'd get combined into a single field like "Name[2]:" when you re-saved. It might've also killed comments? I'm certainly not surprised it only has basic recfile support, because who use recfiles, but I'd be careful using VD with them for anything but viewing.