Yes. It's not just the Modem partition that's causing this issue. There something else that's triggering the issue.
Try this Method for it to be easier:-
1. Flash MiuiCN (Fastboot)
2. Flash TWRP Marble by Nebrassy
3. Boot to Twrp and Backup Boot, Dtbo, Modem, EFS, Persist and Vendor boot...