The issue of conditional ordination is itself a strange anomaly in the fall-out from Vatican II.
In the past, sacraments have generally been conferred sub conditione because something would surface that would through into question the validity of a sacrament that had assumed to have been valid. That original sacrament continued to be assumed valid in the public forum, thus conditional administration of the sacrament ensured that validity and was generally done quietly and secretly.
The questionable validity of the 1968 episcopal rite of consecration throws into turmoil the whole question of Roman rite ordinations derived from bishops consecrated in that form. So, whereas in the past, one assumed that validity of clergy, now doubt has entered publicly. Instead of ensuring validity for a sacrament publicly believed to be valid yet doubt had arisen ex post facto for serious reason, now one questions a priori the validity of 1968-derived Orders. Instead of quietly ensuring validity, conditional ordination now becomes a public matter. Very strange situation compared to past ages!!!