Many Etc/[..] named timezone locations don't work

PostgreSQL:

=# select '2001-02-03T12:13:14 Etc/GMT+1'::timestamptz;
timestamptz
────────────────────────
2001-02-03 13:13:14+00

=# select '2001-02-03T12:13:14 Etc/UTC'::timestamptz;
timestamptz
────────────────────────
2001-02-03 12:13:14+00

In CockroachDB these don't work:

=> select '2001-02-03T12:13:14 Etc/UTC'::timestamptz;
ERROR: parsing as type timestamp: could not parse "2001-02-03T12:13:14 Etc/UTC"

=> select '2001-02-03T12:13:14 Etc/GMT+1'::timestamptz;
ERROR: parsing as type timestamp: could not parse "2001-02-03T12:13:14 Etc/GMT+1"

=> select '2001-02-03T12:13:14 Etc/Zulu'::timestamptz;
ERROR: parsing as type timestamp: could not parse "2001-02-03T12:13:14 Etc/Zulu"

But Etc/Universal and Etc/Greenwich do work:

=> select '2001-02-03T12:13:14 Etc/Universal'::timestamptz;
timestamptz
------------------------
2001-02-03 12:13:14+00

=> select '2001-02-03T12:13:14 Etc/Greenwich'::timestamptz;
timestamptz
------------------------
2001-02-03 12:13:14+00

I'm using the container from DockerHub, `:latest-v26.1`. This does have these files in the zoneinfo if I docker exec in to it:

# ls -l /usr/share/zoneinfo/Etc/
total 140
-rw-r--r-- 10 root root 114 Dec 10 00:00 GMT
-rw-r--r-- 10 root root 114 Dec 10 00:00 GMT+0
-rw-r--r-- 1 root root 116 Dec 10 00:00 GMT+1
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT+10
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT+11
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT+12
-rw-r--r-- 1 root root 116 Dec 10 00:00 GMT+2
-rw-r--r-- 1 root root 116 Dec 10 00:00 GMT+3
-rw-r--r-- 1 root root 116 Dec 10 00:00 GMT+4
-rw-r--r-- 1 root root 116 Dec 10 00:00 GMT+5
-rw-r--r-- 1 root root 116 Dec 10 00:00 GMT+6
-rw-r--r-- 1 root root 116 Dec 10 00:00 GMT+7
-rw-r--r-- 1 root root 116 Dec 10 00:00 GMT+8
-rw-r--r-- 1 root root 116 Dec 10 00:00 GMT+9
-rw-r--r-- 10 root root 114 Dec 10 00:00 GMT-0
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT-1
-rw-r--r-- 1 root root 118 Dec 10 00:00 GMT-10
-rw-r--r-- 1 root root 118 Dec 10 00:00 GMT-11
-rw-r--r-- 1 root root 118 Dec 10 00:00 GMT-12
-rw-r--r-- 1 root root 118 Dec 10 00:00 GMT-13
-rw-r--r-- 1 root root 118 Dec 10 00:00 GMT-14
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT-2
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT-3
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT-4
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT-5
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT-6
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT-7
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT-8
-rw-r--r-- 1 root root 117 Dec 10 00:00 GMT-9
-rw-r--r-- 10 root root 114 Dec 10 00:00 GMT0
-rw-r--r-- 10 root root 114 Dec 10 00:00 Greenwich
-rw-r--r-- 8 root root 114 Dec 10 00:00 UCT
-rw-r--r-- 8 root root 114 Dec 10 00:00 UTC
-rw-r--r-- 8 root root 114 Dec 10 00:00 Universal
-rw-r--r-- 8 root root 114 Dec 10 00:00 Zulu

Go's built-in time/tzdata also works:

package main

import (
"fmt"
"time"
_ "time/tzdata"
)

func main() {
l, err := time.LoadLocation("Etc/UTC")
// Output: Etc/UTC
fmt.Println(err, l)
}

So not sure why some don't work in CockroachDB?

Jira issue: CRDB-62374

Epic CRDB-60818