UTM9.3 ignores DNAT rules with "going to" set to "Internet", which worked in pre 9.3. The rules still can be created, but they doesn´t seem to match anymore...the requests aren´t redirected anymore.
This disallows nice workarounds as rerouting specific services going to internet (as NTP or DNS) to the local networks interface address, that those requests will be handled by the local NTP and DNS proxy...(instead of changing all those time.apple.com, time.windows.com, ntp.dlink.com etc. in your internal network to the UTM´s interface IP)