I cannot access to Internet via IPSec any more after update to 18.1

[xw_y_am]

I installed OPNsense 17.1.9 several months ago, and then set up the IPSec according the wiki. I can access to Internet and visit my local network at the same time. After updating the system to version 18.1, I suddenly find that I cannot access to Internet any more. Are there some different configs between the two version?