x-versions-enabled objects do not support if-match conditional GET

I think I have some understanding of how if-match conditional GET requests are supposed to work.

Given an object with both a dynamic and static link:

vagrant@saio:~$ swift list test --json
[
  {
    "bytes": 0,
    "content_type": "application/symlink",
    "hash": "d41d8cd98f00b204e9800998ecf8427e",
    "last_modified": "2020-05-22T20:08:43.386630",
    "name": "hardlink",
    "symlink_path": "/v1/AUTH_test/test/test"
  },
  {
    "bytes": 0,
    "content_type": "application/symlink",
    "hash": "d41d8cd98f00b204e9800998ecf8427e",
    "last_modified": "2020-05-22T20:07:38.942880",
    "name": "link",
    "symlink_path": "/v1/AUTH_test/test/test"
  },
  {
    "bytes": 8,
    "content_type": "application/octet-stream",
    "hash": "70c1db56f301c9e337b0099bd4174b28",
    "last_modified": "2020-05-22T20:09:50.082480",
    "name": "test"
  }
]

You can make GET/HEAD requests with if-match: <etag> header and swift will only respond 200 if the etag matches:

vagrant@saio:~$ curl -s -H 'x-auth-token: AUTH_tkc0d886a2e02547778f9a3494967b53d0' http://saio:8080/v1/AUTH_test/test/test -I -H 'if-match: 70c1db56f301c9e337b0099bd4174b28' | head -n1
HTTP/1.1 200 OK
vagrant@saio:~$ curl -s -H 'x-auth-token: AUTH_tkc0d886a2e02547778f9a3494967b53d0' http://saio:8080/v1/AUTH_test/test/link -I -H 'if-match: 70c1db56f301c9e337b0099bd4174b28' | head -n1
HTTP/1.1 200 OK
vagrant@saio:~$ curl -s -H 'x-auth-token: AUTH_tkc0d886a2e02547778f9a3494967b53d0' http://saio:8080/v1/AUTH_test/test/hardlink -I -H 'if-match: 70c1db56f301c9e337b0099bd4174b28' | head -n1
HTTP/1.1 200 OK
vagrant@saio:~$ curl -s -H 'x-auth-token: AUTH_tkc0d886a2e02547778f9a3494967b53d0' http://saio:8080/v1/AUTH_test/test/test -I -H 'if-match: not-the-etag' | head -n1
HTTP/1.1 412 Precondition Failed
vagrant@saio:~$ curl -s -H 'x-auth-token: AUTH_tkc0d886a2e02547778f9a3494967b53d0' http://saio:8080/v1/AUTH_test/test/link -I -H 'if-match: not-the-etag' | head -n1
HTTP/1.1 412 Precondition Failed
vagrant@saio:~$ curl -s -H 'x-auth-token: AUTH_tkc0d886a2e02547778f9a3494967b53d0' http://saio:8080/v1/AUTH_test/test/hardlink -I -H 'if-match: not-the-etag' | head -n1
HTTP/1.1 412 Precondition Failed

This API behavior doesn't seem to follow on versioned objects:

vagrant@saio:~$ swift list vtest --json --versions
[
  {
    "bytes": 8,
    "content_type": "application/octet-stream",
    "hash": "70c1db56f301c9e337b0099bd4174b28",
    "is_latest": true,
    "last_modified": "2020-05-22T20:09:52.841630",
    "name": "test",
    "version_id": "1590178192.84163"
  }
]
vagrant@saio:~$ curl -s -H 'x-auth-token: AUTH_tkc0d886a2e02547778f9a3494967b53d0' http://saio:8080/v1/AUTH_test/vtest/test -I -H 'if-match: 70c1db56f301c9e337b0099bd4174b28' | head -n1
HTTP/1.1 200 OK
vagrant@saio:~$ curl -s -H 'x-auth-token: AUTH_tkc0d886a2e02547778f9a3494967b53d0' http://saio:8080/v1/AUTH_test/vtest/test -I -H 'if-match: not-the-etag' | head -n1
HTTP/1.1 200 OK

Which seems surprising.