VPN Server breaks DDNS (Openvpn)

Routers
1

Starting 5 days ago. Openvpn server started breaking Dynamic DNS. I can replicate this issue. As soon as the VPN server is enabled DDNS breaks. If I turn of the VPN Server and Stop start DDNS several times DDNS re-enables
Model GL.iNet GL-A1300
Firmware. OpenWrt 21.02.2 r16495-bf0c965af0 / LuCI openwrt-21.02 branch git-22.347.45520-d30ab74

3

Hi,
Please check the ports used by the OpenVPN server and DDNS service to see if there is a conflict.

Please try to reproduce the problem and export the router log