Cannot set Failsafe to GPS Rescue

[stone ridge]

Hello, i'm trying to set the Failsafe procedure to GPS Rescue on my iFlight Nazgul DC5 Eco. The GPS is working (I have the take-off distance and the arrow showing me from where I've take-off, and the GPS coordinates are fine.), I've set my Stage 1 settings according to the drone specificities, but when I select "GPS Rescue" and click on "Save & Restart", everytime the drone is restarting it go back to "Fall" procedure.
Haslinghuis on Github told me I should have GPS working when enabling the setting, but i've tried to re-enable it today when I was outside with 18 satellites and it still rolling back to fall.
The flight controller is a iFlight Blitz F435, the GPS is on UART4 with 115200 baudrate, but i've tried 38400 & auto with the same result.
The firmware is 4.5.1 BTFL
My support ID is 53c76a7b-ba4b-4cc7-bfb8-63cf60be04b3
The support ID was generated outside, with battery plugged & GPS working.
Right now i'm back to home so the drone is on the benchtable, so the #version and #status below was made without battery & without GPS

version

Betaflight / AT32F435G (A435) 4.5.1 Jan 16 2025 / 01:10:09 (77d01ba3b) MSP API: 1.46

config rev: b0f3ab0

board: manufacturer_id: IFRC, board_name: IFLIGHT_BLITZ_F435

#status
MCU AT32F435 Clock=288MHz, Vref=3.27V, Core temp=33degC
Stack size: 2048, Stack address: 0x2002fff0
Configuration: CONFIGURED, size: 3771, max available: 16384
Devices detected: SPI:1, I2C:1
Gyros detected: gyro 1
GYRO=ICM42688P, ACC=ICM42688P, BARO=DPS310
OSD: MSP (53 x 20)
BUILD KEY: 8e72049df9510a29c288d019dc86cfb4 (4.5.1)
System Uptime: 39 seconds, Current Time: 2025-04-21T21:41:05.050+00:00
CPU:23%, cycle time: 125, GYRO rate: 8000, RX rate: 15, System rate: 9
Voltage: 4 * 0.01V (0S battery - NOT PRESENT)
I2C Errors: 0
FLASH: JEDEC ID=0x00ef4019 32M
GPS: NOT CONNECTED, UART4 115200 (set to 38400), NOT CONFIGURED, version = unknown
Arming disable flags: RXLOSS THROTTLE CLI MSP DSHOT_TELEM

[leaden jasper]

Hey! We think our bot can help with your question; click the button below to generate an answer.
Please also give us a support ID

1. Open the CLI tab
2. Click the "Submit Support Data" button
3. Optionally enter a brief description of the problem
4. Wait for it to finish
5. Copy the resulting support ID
6. Paste it here

{'cause': 'thread creation'}

[stone ridge]

53c76a7b-ba4b-4cc7-bfb8-63cf60be04b3

#DIFF ALL

Video showing the issue

[nocturne gust]

In this case M10 GNSS unit is recognized. What is the status of sensor displayed ?

GPS: connected, UART4 38400 (set to 38400), configured, version = M10

Using https://app.betaflight.com and assigning port to GPS (none attached) I'm able to assign GPS Rescue fail-safe mode - which retains after reboot.

[stone ridge]

Hello Haslinghuis, thank for your answer.
The Gyro, Accell, Baro & GPS are Yellow, Mag & Sonar are gray