Zone 23. Central Asia: JT (Mongolia), UA0Y, BY3G-L (NeiMenggu), BY9G-L (GanSu), BY9M-R (NingXia), BY9S-Z (QingHai) and BY0.
Zone 24. Eastern Asia: BV9P (Pratas Is.), BV (Taiwan), BY1, BY2, BY3A-F (TianJin), BY3M-R (HeBei), BY3S-X (ShanXi), BY4, BY5, BY6, BY7, BY8, BY9A-F (ShaanXi), VR (Hong Kong), and XX (Macau).
This makes perfect sense.