In recent months, we've had (in no particular order):
Ninja Zelgius (Nov 2024), then Resplendent Black Knight (Apr 2024) [both voiced by Junji Majima]
Legendary Camilla (Dec 2023), then Kid F!Robin and Kid M!Robin (Apr 2024) [all voiced by Miyuki Sawashiro]
Ginnungagap (Nov 2023), then Kid Chrom (Apr 2024) [both voiced by Ayumi Tsunematsu]
Spring Chloe (Mar 2024), then Attuned Caeda (Mar 2024) [both voiced by Saori Hayami]
Winter Claude (Dec 2023), then Castor (Mar 2024) [both voiced by Toshiyuki Toyonaga]
Harvest E!Anna and A!Anna (Oct 2023), then Resplendent Selena (Mar 2024) [all voiced by Saori Seto]
Safy (Jan 2024), then Spring Mirabilis (Mar 2024) [both voiced by Misaki Kuno]
Resplendent Fir (Nov 2023), then Ivy (Feb 2024) [both voiced by Yoko Hikasa]
Validar (Dec 2023), then Kagetsu (Feb 2024) [both voiced by Takehito Koyasu]
Fargus (Nov 2023), then Devotion Vigarde (Feb 2024) [both voiced by Kenta Miyake]
CYL F!Corrin (Aug 2023), then New Year's F!Kana (Jan 2024) [both voiced by Satomi Sato]
Basically, it happens often enough for it to be a noticeable trend.