WAN selection misconfigured after upgrade from 23.1 to 23.7

[Karl]

Something strange happened after upgrading my OPNsense from 23.1 to 23.7.
I have 2 WANs (WANcable, WANdsl), configured as single gateways (_DHCP).
I have 1 LAN (192.168.100.x)
I have 1 WLAN (192.168.200.x)
When using OPNsense 23.1 I (somehow) managed to configure that the WLAN should only use WANdsl for internet access while LAN only uses WANcable for internet access. It worked fine.
After the upgrade to 23.7 both LAN and WLAN only use WANcable for internet access and I don't know why.
Any ideas where to look? I can't find any hints in the official documentation.
Do I have to create special firewall rules that were not needed on 23.1? Any switch that changed somewhere in a deep submenu between 23.1 and 23.7? Or a bug? :-)

[Karl]

Quick update: It's working again after adding a new firewall rule to WLAN to use WANdsl as gateway for any (and also adding a DNS allow rule before that). Strange thing is: I did not have this rule before on 23.1, but it still worked somehow. Is it possible to have an active firewall rule that is not being shown in the web UI (on 23.1 that is, 23.7 did not show a rule in the UI and it did not work without that rule).