Delete one firewall rule on WAN/LAN/TEST -> All firewall rules gone

[patient0]

Good Morning,

On a OPNsense lab instance, I'm on latest DEV 26.1.a_621-amd64 and created a rule on WAN for ping. Afterwards I deleted that rule and boom, all firewall rules were gone, on all interfaces. That was ... surprising :). The firewall rules were created in the standard 'Rules', not 'Rules [new]'

That instance runs on Proxmox (which runs on a Hetzner root server) and has three virtual interfaces and Tayga: WAN (vtnet0), LAN (vtnet1), TEST (vtnet2) & Tayga.

If I delete one/any rule on WAN, LAN or TEST, all firewall rules on all four interfaces disappear in the GUI (also on Tayga). On interface Tayga deleting a rule does work normally.

In the config file the rules are present and do work, would indicate a GUI issue.

Is that something anyone else encountered? I can share the working and non-working config.

Adding, modifing, enabling/disabling rules does also work correctly.

[patient0]

Answering myself: After diff-ing the two configs, there is an extra <rule> ... </rule> in the config file.

Right after </nat><filter> there is the wrongly added '<rule>' and before <scrubs> is the surplus closing </rule>.
Manually removing these two lines made the rules appear again in the GUI.