Why does "IPIfNonMatch" make some domain matches fail which are successful when using "AsIs"?

[sci-42ver]

I originally posted one issue which is marked completed and I have also already solved that issue with the collaborator's help (Thanks). But I still have some small questions.

I use V2Ray 5.9.0, and I keep using v4 config with ExecStart=/usr/bin/v2ray run -config /etc/v2ray/config.json -format json in /usr/lib/systemd/system/v2ray.service because I have some problems with v5 and v4 has more resources about config than v5.

When I use "AsIs", with config (Here I only post part of the config file. If you need the full one, please tell me, thanks.)

...
  "routing": {
    "domainStrategy": "AsIs",
    "rules": [
      {
        "type": "field",
        "outboundTag": "direct",
        "domain": [
          "ipv6"
        ],
        "enabled": true
      },
    ]
  },  
...
  "dns": {
    "servers": [
      "2001:4860:4860:0:0:0:0:8888"
    ]   
  },  
...

then "www.test-ipv6.com" won't go through the proxy and if I modified above to "outboundTag": "proxy", then "www.test-ipv6.com" will go through the proxy. IMHO it means that the above routing rule takes effect.

$ sudo vim /var/log/v2ray/error.log
...
2023/11/12 14:27:51 [Info] [3996237950] proxy/http: request to Method [CONNECT] Host [ipv4.lookup.test-ipv6.com:443] with URL [//ipv4.lookup.test-ipv6.com:443]                      
2023/11/12 14:27:51 [Info] [3996237950] app/dispatcher: sniffed domain: ipv4.lookup.test-ipv6.com for tcp:ipv4.lookup.test-ipv6.com:443
2023/11/12 14:27:51 [Warning] [3996237950] app/dispatcher: default route for tcp:ipv4.lookup.test-ipv6.com:443
2023/11/12 14:27:51 [Info] [3996237950] proxy/freedom: opening connection to tcp:ipv4.lookup.test-ipv6.com:443
2023/11/12 14:27:51 [Info] [3996237950] transport/internet/tcp: dialing TCP to tcp:ipv4.lookup.test-ipv6.com:443
...

However with the "domainStrategy": "IPIfNonMatch" modification, the above routing match fails

$ sudo vim /var/log/v2ray/error.log
...
2023/11/12 14:23:01 [Info] [2650564958] proxy/http: request to Method [CONNECT] Host [ipv4.lookup.test-ipv6.com:443] with URL [//ipv4.lookup.test-ipv6.com:443]                      
2023/11/12 14:23:01 [Info] [2650564958] app/dispatcher: sniffed domain: ipv4.lookup.test-ipv6.com for tcp:ipv4.lookup.test-ipv6.com:443
2023/11/12 14:23:01 [Debug] app/dns: domain ipv4.lookup.test-ipv6.com will use DNS in order: [UDP:[2001:4860:4860::8888]:53 UDP:114.114.114.114:53 UDP:8.8.8.8:53 localhost] [TypeA TypeAAAA] 
2023/11/12 14:23:01 [Debug] app/dns: UDP:[2001:4860:4860::8888]:53 querying DNS for: ipv4.lookup.test-ipv6.com.
...
2023/11/12 14:23:01 [Info] app/dns: UDP:[2001:4860:4860::8888]:53 got answer: ipv4.lookup.test-ipv6.com. TypeAAAA -> [] 219.354846ms
2023/11/12 14:23:01 [Debug] app/dns: UDP:[2001:4860:4860::8888]:53 updating IP records for domain:ipv4.lookup.test-ipv6.com.
2023/11/12 14:23:01 [Info] app/dns: UDP:[2001:4860:4860::8888]:53 got answer: ipv4.lookup.test-ipv6.com. TypeA -> [216.218.223.250 176.58.89.223] 219.378313ms
2023/11/12 14:23:01 [Debug] app/dns: UDP:[2001:4860:4860::8888]:53 updating IP records for domain:ipv4.lookup.test-ipv6.com.
2023/11/12 14:23:01 [Info] [2650564958] app/dispatcher: taking detour [proxy] for [tcp:ipv4.lookup.test-ipv6.com:443]       

With the v2fly v4 routing doc

IPIfNonMatch：当域名没有匹配任何基于域名的规则时，将域名解析成 IP（A 记录或 AAAA 记录），进行基于 IP 规则的匹配；

I think the IPIfNonMatch will keep the "domain" related rule, but it seems not, could someone help with this problem?