I have the same problem with C1112-8P and connected IKE/IPsec clients.
The Workaround is not working!
Lab_1112_1_DUT#show ip nat translations
Pro Inside global Inside local Outside local Outside global
udp 11.12.1.1:5062 11.13.0.2:4500 11.12.1.2:4500 11.12.1.2:4500
udp 11.12.1.1:512 11.13.0.2:500 11.12.1.2:500 11.12.1.2:500
Total number of translations: 2