Last week I upgraded my WRT3200 & WRT1900 to 21.02.1
The upgrade was an easy task and the performance/stability is brilliant.
The WRT3200acm is the main router supported by a couple of APs.
I have the VPN Policy package installed running with three interfaces WAN
and two Wireguard (WG1 & WG2).
A minor issue (bug):
In 21.02.1 Luci doesn't show the "Service Gateways" in VPN Policy after a reboot
Fortunately the policies are not impacted, the reason why it's a minor issue.
The 19.07.8 version did always show the "Service Gateways"
Please see the attached pictures.
My VBR 0.3.4-8 works well on 21.02.1.
I did get a "Running" indication once and a "Restart" button click on the VBR LUCI App fixed the issue.
But, VBR should start up normally on reboot so you may have a unique setting in your configs that is causing it to freeze-up.
I am not using WireGuard but using OpenVPN.
Sorry, I cannot be of more assistance.
Thanks for you input / .... by the way I recommend trying Wireguard 
The routing starts normally on reboot and by changes, no freezes ... so the intended operational VPN routing functionality is ok /
I see the minor issue as Luci not fetching and displaying the available "Service Gateway" information.
