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Service name resolution broken on alpine:20201218

The image alpine:20201218 has a problem with name resolution broken.

$       docker run  --rm  --name alpine2   alpine:20201218   sh -c 'apk add curl >/dev/null; curl  https://gist.github.com; nslookup gist.github.com; '
 curl: (6) Could not resolve host: gist.github.com


Server:		192.168.65.1
Address:	192.168.65.1:53

Non-authoritative answer:
gist.github.com	canonical name = github.com
Name:	github.com
Address: 140.82.113.3

Non-authoritative answer:
gist.github.com	canonical name = github.com

The image alpine:3.12 works well with name resolution:

$	docker run  --rm  --name alpine2   alpine:3.12.3   sh -c 'apk add curl >/dev/null; curl  https://gist.github.com; '
<html><body>You are being <a href="https://gist.github.com/discover">redirected</a>.</body></html>