Link flapping on mwan3, using keepalived with VMAC

Ahoy friends.
Currently i'm bringing up, high availability, in my home network.
I got 2 routers, one master and one backup, and both have 2 internet connections available. The 2nd one is ONLY being used in case of failure of the frist one, not for load balancing.
In order to setup port forwardings properly, on the ISP router, i have to use use_vmac parameter on the WAN side of my OpenWrt routers.

Unfortunately, mwan3 is not able to handle this well, it brings the WAN links down and up again, more or less every 30 seconds. Without mwan3 it works well.
Is there a way to fix this, or workaround this issue? Maybe for explanation. When specifying the use_vmac parametre in keepalived, it creates a macvlan interface, with the name vrrp.51. Do i have to put this macvlan interface into mwan3 maybe, instead of the physical one? Or does someone have any suggestions?
Connectivity is given through the interface, for a certain amount of time, but mwan3 brings it down without any reason.

Shown below is my network topology.

That's how the logs look like:

Fri Oct 29 21:42:02 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.222.222" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:42:06 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.220.220" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:42:06 2021 user.notice mwan3track[3637]: Interface wanb (bonding-i0.1100) is disconnecting
Fri Oct 29 21:42:15 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:42:19 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.8.8" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:42:23 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.222.222" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:42:27 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.220.220" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:42:36 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 8
Fri Oct 29 21:42:37 2021 user.notice mwan3track[3637]: Interface wanb (bonding-i0.1100) is connecting
Fri Oct 29 21:42:37 2021 user.info mwan3track[3637]: Lost 9 ping(s) on interface wanb (bonding-i0.1100). Current score: 8
Fri Oct 29 21:42:51 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:42:55 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.8.8" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:42:59 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.222.222" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:43:03 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.220.220" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:43:03 2021 user.notice mwan3track[3637]: Interface wanb (bonding-i0.1100) is disconnecting
Fri Oct 29 21:43:12 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:43:16 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.8.8" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:43:20 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.222.222" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:43:24 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.220.220" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:43:33 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 8
Fri Oct 29 21:43:34 2021 user.notice mwan3track[3637]: Interface wanb (bonding-i0.1100) is connecting
Fri Oct 29 21:43:34 2021 user.info mwan3track[3637]: Lost 9 ping(s) on interface wanb (bonding-i0.1100). Current score: 8
Fri Oct 29 21:43:48 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:43:52 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.8.8" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:43:56 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.222.222" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:44:00 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.220.220" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:44:00 2021 user.notice mwan3track[3637]: Interface wanb (bonding-i0.1100) is disconnecting
Fri Oct 29 21:44:09 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:44:13 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.8.8" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:44:17 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.222.222" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:44:21 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.220.220" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:44:30 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 8
Fri Oct 29 21:44:32 2021 user.notice mwan3track[3637]: Interface wanb (bonding-i0.1100) is connecting
Fri Oct 29 21:44:32 2021 user.info mwan3track[3637]: Lost 9 ping(s) on interface wanb (bonding-i0.1100). Current score: 8
Fri Oct 29 21:44:46 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:44:50 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.8.8" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:44:54 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.222.222" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:44:58 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.220.220" on interface wanb (bonding-i0.1100). Current score: 10
Fri Oct 29 21:44:58 2021 user.notice mwan3track[3637]: Interface wanb (bonding-i0.1100) is disconnecting
Fri Oct 29 21:45:07 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:45:11 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.8.8" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:45:15 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.222.222" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:45:19 2021 user.info mwan3track[3637]: Check (ping) failed for target "208.67.220.220" on interface wanb (bonding-i0.1100). Current score: 9
Fri Oct 29 21:45:19 2021 daemon.info dnsmasq-dhcp[25777]: DHCPREQUEST(bonding-i0.3) 192.168.3.157 8e:7d:94:79:83:f6
Fri Oct 29 21:45:19 2021 daemon.info dnsmasq-dhcp[25777]: DHCPACK(bonding-i0.3) 192.168.3.157 8e:7d:94:79:83:f6 Galaxy-A72
Fri Oct 29 21:45:28 2021 user.info mwan3track[3637]: Check (ping) failed for target "8.8.4.4" on interface wanb (bonding-i0.1100). Current score: 8

The specific part of the keepalived.conf

vrrp_instance E2 {
  state MASTER
  interface bonding-i0.1100
  virtual_router_id 51
  priority 100
  advert_int 1
  use_vmac # **That's causing an issue, while using mwan3, without mwan3 no issue. Creates a macvlan Interface**
  virtual_ipaddress {
    192.168.154.4/24
  }
  virtual_routes {
    src 192.168.154.4 to 0.0.0.0/0 via 192.168.154.1 dev bonding-i0.1100 metric 5
  }
  authentication {
    auth_type PASS
    auth_pass secret
  }
  preempt
}

Thanks in advance!