Outbound NAT for PPPoE broken

[ets_steffen]

I have issues with NAT with version 23.7.3

Please see the attached screenshot of a trace at the WAN PPPoE interface.

The ping to 8.8.4.4 is from the dpinger, monitoring the gateway. The gateway is marked as online.

The ping to 1.1.1.1 is from my PC at 192.168.17.10. Why is it setting the local IP as source address?

No wonder there is no reply. I have the outbound NAT set to hybrid.
There is a rule for STATIC port set for 192.168.17.10.
This is because of a SIP-Gateway that is going to be used.

For a second WAN Interface using DHCP, everthing works as expected.

Any ideas how I can fix this?

Thanks!