Update:

The issue name was Route loading error if with device created from container.

A new test, I read include/constraint/interface-name.xml.i, see there is a regex for interface names, so I rename the clash container created interface to tun0 which matches the regex, no error.

Breifly, if I create a interface by other program/container, not matching the regex which is for now
<regex>(bond|br|dum|en|ersp|eth|gnv|ifb|ipoe|lan|l2tp|l2tpeth|macsec|peth|ppp|pppoe|pptp|sstp|sstpc|tun|veth|vti|vtun|vxlan|wg|wlan|wwan)[0-9]+(.\d+)?|pod-[-_a-zA-Z0-9]{1,11}|lo</regex>

and I put the interface in protocol static, the whole protocol static will not be loaded on boot.

Start up message

vyos-rt vyos-config[971]: Configuration error

configure command message

WARNING: There was a config error on boot: saving the configuration now could overwrite data.
You may want to check and reload the boot config

load & compare

+ static {
+     route 192.168.24.0/24 {
+         next-hop 192.168.1.1 {
+         }
+     }
+     route 192.168.51.0/24 {
+         interface wg1 {
+         }
+     }
+     route 198.18.0.0/15 {
+         interface utun0 {
+             disable
+         }
+     }
+     table 18 {
+         route 0.0.0.0/0 {
+             interface utun0 {
+                 disable
+             }
+             next-hop 198.18.0.1 {
+                 disable
+                 interface "utun0"
+             }
+         }
+     }
+ }

commit & save works.

utun0 is the clash TUN interface created from container.

I remove & test entry by entry, if I don't use the interface utun0, everyting works fine.

If I add utun0, like

interface utun0 or next-hop 198.18.0.1 interface utun0

both in protocol static route and prototcol static table route

disabled or not disabled

error occurs on boot, but can be load & commit.

Lucky thing for me is my route works if not with interface utun0.

Extra test:

To test if this occurs on any interface not defined in config tree:

I try set protocol static route 192.168.0.0/24 interface wg9 and reboot. No error.

I try with utun1, also not defined, error Incorrect path /sys/class/net/utun1: no such file or directory after commit.

I grep utun0 /var/log -r found no error at all.