Wireguard site-to-site handshakes but don’t pass traffic (opnsense + openwrt)

I would like to make a wireguard tunnel from OPNsense (Site A) to OpenWrt (Site B). The wireguard handshake is fine, but I can't access anything from A to B (I dont wanna access B to A).
It is pretty much what is described here (it is closed, I cant reply). But the solution seems not to work. Maybe it is outdated. ReDaLeRt does it still work for you?

I am using wireguard in openwrt for a couple of years.
But if I use an Raspberry Pi instead of OpenWrt, OPNsense can easily handle the vpn tunnel. That is the reason that OpenWrt has some specialty...

I hope for some help. Something is missing and I cant find anything else online.

Please connect to your OpenWRT device using ssh and copy the output of the following commands and post it here using the "Preformatted text </> " button:

Remember to redact passwords, MAC addresses and any public IP addresses you may have:

ubus call system board
cat /etc/config/network
cat /etc/config/dhcp
cat /etc/config/firewall
ip route show
wg show

Also post settings like wg show and your WireGuard config from the OPNsense side