Multi WAN PPPoE issues

[ets_steffen]

Hi there!

After upgrade to 23.7 it seems, that Multi WAN via PPPoE is broken.
I have a WAN configured as DHCP, via a DOCSIS modem.
The other there WAN interfaces are PPPoE.
If just a single PPPoE line and the DHCP line is plugged in, everything works as expected.

As soon as I plug in a second PPPoE line, the first one goes offline.

It seems like I can just get one PPPoE line online at a time.
The DHCP line stays online all the time.

This setup definitely worked before.

Any ideas how I could resolve this issue?
Is there a location where I can see a more precise log, of what the PPPoE interfaces are doing?

Thanks a lot!