On Max10 the watchdog in "dual image configuration" doesn't work

I’m facing some problem in setting up the Max10 in dual-boot configuration.

How our Max10 is configured:

UFM0 – Boot fw (Nios)

CFM1 – Boot hw

CFM0 – Application hw

Application fw(Nios) is on an external Flash.

The board starts in Boot, then switches in Application using register DUAL_BOOT_0_BASE (document: Intel MAX 10 FPGA Configuration User Guide (ug_m10_config.pdf) )

I enabled the watchdog in the application "convert programming files" -> "Options/Boot info" but when the control passes from boot to application and on application there's no firmware for Nios, the control doesn't revert to boot (aka the watchdog doesn't work)