Vtol pitches down when front motor not connected


I had a moment with my vtol. it is a loong 2160 vtol (4+1) that I forgot to plug in the front motor, while being in the air and going to transition into fbwb I notice that the front prop wasn’t spinning then I decided ( before the FS time limit for transition had passed) to switch it into a hover mode only to find out that it enter a weird glitch phase where the front motors will receive a lower pwm value than the back motors making it boat towars nose dive if I put the throttle stick down. I had attached the logfile, any ideas why? (also forgot to mentioned that when I triggered a hover mode I did enter for 1 milisecond into loiter mode for fixed wing).
I did put connect back the esc and it hovered in the same mode but without any issues .