I think i know, where my problem, if you connect to your RpI0 to ethernet and if you don’t connect to your wifi router, internal wifi module don’t wont go to monitor mode, but if you connect to your wifi ssid, problem is gone)
root@pi-tail:~# mon0up
++ Bringing mon0 up
++ mon0 should be up:
5: mon0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN mode DEFAULT group default qlen 1000
link/ieee802.11/radiotap b8:27:eb:5c:28:59 brd ff:ff:ff:ff:ff:ff
root@pi-tail:~#
But i think it’s work wrong, maybe i’m unjust)