Hah, apparently in Switzerland when you get married to someone of the same legal gender one of you will get temporarily, virtually, legally transed for a moment, for software reasons. 
See page 10 in https://www.vsed.ch/fileadmin/user_upload/FTW_Nr._4_FIS_Ehe_fuer_alle_PUB__3_.pdf and h/t @robryk for finding this. 
Follow
@timorl I think that was the case only until https://www.bj.admin.ch/bj/de/home/gesellschaft/zivilstand/infostar/infostar-ng.html
