pfSense

Where you have a dynamic interface removed and re-added while running IKEv2 in strongswan, things break. Good easily replicable example is an OpenVPN server instance bound to the same WAN as IPsec. Restart OpenVPN, and strongswan will kick out:

 15[IKE] old path is not available anymore, try to find another
 15[IKE] sending address list update using MOBIKE

at which time it tries connecting to every IP sent via MOBIKE, and gets itself into a mess (VPN no longer works) until you X out the connection under Status>IPsec.