TriCopter tail servo servo_trim always reset

I changed the motor output to respect the group order.
1,2 & 6 are now motor and 3 is servo tail.
When SERVO_BLH_AUTO=1, whatever is the motor output, SERVO_TRIM is reset to SERVO_MIN at boot time.
My esc are blheli but not blheli_32 and are not dshot compliant, don’t if it could be the reason why.
MOT_PWM_TYPE=0 and I tried with SERVO_BLH_OTYPE=0 and 2.
So unless I misunderstood something, tricopter is not flyable when SERVO_BLH_AUTO=1 with my setup/gear.

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