Why coredns occurs this error: [ERROR] plugin/errors: 2 kube-dns.kube-system. AAAA: read udp 10.244.0.2:42616->8.8.4.4:53: i/o timeout v0.16.1

I install kubernetes v1.23.1 with flannel, the coredns version is 1.8.6.
when I execute ‘nslookup kube-dns.kube-system’ command in a pod, this error occured:

[ERROR] plugin/errors: 2 kube-dns.kube-system. AAAA: read udp 10.244.0.2:42616->8.8.4.4:53: i/o timeout
[ERROR] plugin/errors: 2 kube-dns.kube-system. A: read udp 10.244.0.2:54528->8.8.4.4:53: i/o timeout

My analysis as follows:
1 coredns pod is running
kube-system coredns-5dfff794cb-j6wkv 1/1 Running 0 174m 10.244.0.3 master
kube-system coredns-5dfff794cb-nbn4r 1/1 Running 0 174m 10.244.0.2 master

2 coredns service is running
kube-dns ClusterIP 10.1.0.10 53/UDP,53/TCP,9153/TCP 175m k8s-app=kube-dns

3 the pod ip assigned to the service
NAME ENDPOINTS AGE
kube-dns 10.244.0.2:53,10.244.0.3:53,10.244.0.2:53 + 3 more… 174m

4 pod can access the coredns ip:
PING 10.244.0.2 (10.244.0.2): 56 data bytes
64 bytes from 10.244.0.2: seq=0 ttl=62 time=0.762 ms
64 bytes from 10.244.0.2: seq=1 ttl=62 time=0.573 ms

5 pod can’t get kubernetes.default’s ip by service cluster ip:
/etc # nslookup kubernetes.default
Server: 10.1.0.10
Address: 10.1.0.10:53

;; connection timed out; no servers could be reached

6 pod can’t get kubernetes.default’s ip by coredns’s ip:
/etc # nslookup kubernetes.default 10.244.0.2
Server: 10.244.0.2
Address: 10.244.0.2:53

;; connection timed out; no servers could be reached

7 the all error logs of coredns service as follows:
[ERROR] plugin/errors: 2 kube-dns.kube-system. AAAA: read udp 10.244.0.2:42616->8.8.4.4:53: i/o timeout
[ERROR] plugin/errors: 2 kube-dns.kube-system. A: read udp 10.244.0.2:54528->8.8.4.4:53: i/o timeout

So, how can I further analysis and fix it, many thanks!

Cluster information:

Kubernetes version: 1.23.1
Cloud being used: my self vm
Installation method: yum and kubeadm init
Host OS: centos 7.4
CNI and version: docker 19.03.13
CRI and version: flannel 0.16.1

It’s a known bug of busybox 1.32, v1.28.3 working.