[BUG] Update deletes extra Partitions...

[vishalvodro]

1. Installed Ventoy to USB HDD.
2. Made several FAT32 Partitions afterwards.
3. Run Ventoy again.
4. Click on Update.
5. Ventoy re-uploaded into USB but those extra Partitions are gone/Deleted including 32MB FAT Partition.
6. Only Ventoy exFAT Partition is left in the USB.

Please Fix.