Your log in inconclusive as to what error you are reporting, since there are quite a few.
In addition you are using unofficial modifications to the original Klipper that may or may not contribute to your issues.
Most likely the error that killed your print is:
b'Got EOF when reading from device'
Stats 6255.1: gcodein=0 mcu: mcu_awake=0.002 mcu_task_avg=0.000011 mcu_task_stddev=0.000010 bytes_write=25248848 bytes_read=3708161 bytes_retransmit=9 bytes_invalid=0 send_seq=434526 receive_seq=434526 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=0 freq=63999891 heater_bed: target=0 temp=50.0 pwm=0.000 sysload=0.29 cputime=287.389 memavail=2652776 print_time=5248.318 buffer_time=0.000 print_stall=8 extruder: target=0 temp=77.5 pwm=0.000
Stats 6256.1: gcodein=0 mcu: mcu_awake=0.002 mcu_task_avg=0.000011 mcu_task_stddev=0.000010 bytes_write=25248848 bytes_read=3708161 bytes_retransmit=9 bytes_invalid=0 send_seq=434526 receive_seq=434526 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=1 freq=63999891 heater_bed: target=0 temp=50.0 pwm=0.000 sysload=0.29 cputime=287.394 memavail=2653812 print_time=5248.318 buffer_time=0.000 print_stall=8 extruder: target=0 temp=77.5 pwm=0.000
Stats 6257.1: gcodein=0 mcu: mcu_awake=0.002 mcu_task_avg=0.000011 mcu_task_stddev=0.000010 bytes_write=25248848 bytes_read=3708161 bytes_retransmit=9 bytes_invalid=0 send_seq=434526 receive_seq=434526 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=2 freq=63999891 heater_bed: target=0 temp=50.0 pwm=0.000 sysload=0.29 cputime=287.399 memavail=2653696 print_time=5248.318 buffer_time=0.000 print_stall=8 extruder: target=0 temp=77.5 pwm=0.000
Stats 6258.1: gcodein=0 mcu: mcu_awake=0.002 mcu_task_avg=0.000011 mcu_task_stddev=0.000010 bytes_write=25248848 bytes_read=3708161 bytes_retransmit=9 bytes_invalid=0 send_seq=434526 receive_seq=434526 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=3 freq=63999891 heater_bed: target=0 temp=50.0 pwm=0.000 sysload=0.29 cputime=287.404 memavail=2653444 print_time=5248.318 buffer_time=0.000 print_stall=8 extruder: target=0 temp=77.5 pwm=0.000
Stats 6259.1: gcodein=0 mcu: mcu_awake=0.002 mcu_task_avg=0.000011 mcu_task_stddev=0.000010 bytes_write=25248848 bytes_read=3708161 bytes_retransmit=9 bytes_invalid=0 send_seq=434526 receive_seq=434526 retransmit_seq=2 srtt=0.000 rttvar=0.000 rto=0.025 ready_bytes=0 upcoming_bytes=4 freq=63999891 heater_bed: target=0 temp=50.0 pwm=0.000 sysload=0.29 cputime=287.409 memavail=2652184 print_time=5248.318 buffer_time=0.000 print_stall=8 extruder: target=0 temp=77.5 pwm=0.000
Timeout with MCU 'mcu' (eventtime=6260.132126)
Transition to shutdown state: Lost communication with MCU 'mcu'