Need help! Wireguard + mwan3 + wan + wanb(Lte) failower

Installing and Using OpenWrt
1

Hello all !
Need help to work wireguard client on wanb(lte) when wan is down.
VPS(212.x.x.x 10.66.66.1)<---><--->wan (172.17.165.64/24)<--> Openwrt(10.66.66.2 192.168.0.1)<-->LAN(192.168.0.0/24)
or when wan is down
VPS(212.x.x.x 10.66.66.1)<---><--->wanb (192.168.8.1)<--> Openwrt(10.66.66.2 192.168.0.1)<-->LAN(192.168.0.0/24)

client connect to vps and go to the lan over NAT

TP-Link1043ND v2.1
OpenWrt 19.07.5 r11257-5090152ae3
mwan3 2.10.5-1

On wan interface all work fine. But when i unplug wan wireguard(openwrt) is not conected to vps server.
All internet traffic go to wanb with no problems. So failover work fine.

how do?

2

Output of "ip route list table 1-250"

Table 1: default via 172.17.165.1 dev eth0.2 proto static metric 10
10.66.66.0/24 dev wg proto kernel scope link src 10.66.66.2
172.17.165.0/24 dev eth0.2 proto static scope link metric 10
192.168.0.0/24 dev br-lan proto kernel scope link src 192.168.0.1
212.x.x.x via 172.17.165.1 dev eth0.2 proto static metric 10
Table 2: default via 192.168.8.1 dev eth2 proto static src 192.168.8.105 metric 20
10.66.66.0/24 dev wg proto kernel scope link src 10.66.66.2
192.168.0.0/24 dev br-lan proto kernel scope link src 192.168.0.1
192.168.8.0/24 dev eth2 proto static scope link metric 20