By tzdata-2019c, Pacific/Norfolk supported daylight saving time.
When I set java.locale.providers system property to CLDR on Japanese on Pacific/Norfolk timezone,
TimeZone name was not changed even if the date was in daylight saving.

Test result is as follows:

Japanese translation was on default setting.
(7th character was changed from \u590f to \u5cf6 on 2020.04.22 line)
$ LANG=ja_JP.UTF-8 TZ=Pacific/Norfolk ~/jdk-15+6/bin/java tztest1.java
2020.01.22 23:42:19 NFST \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u590f\u6642\u9593
2020.02.22 23:42:19 NFST \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u590f\u6642\u9593
2020.03.22 23:42:19 NFST \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u590f\u6642\u9593
2020.04.22 23:42:19 NFT \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.05.22 23:42:19 NFT \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.06.22 23:42:19 NFT \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.07.22 23:42:19 NFT \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.08.22 23:42:19 NFT \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.09.22 23:42:19 NFT \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.10.22 23:42:19 NFST \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u590f\u6642\u9593
2020.11.22 23:42:19 NFST \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u590f\u6642\u9593
2020.12.22 23:42:19 NFST \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u590f\u6642\u9593
2021.01.22 23:42:19 NFST \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u590f\u6642\u9593

But I used -Djava.locale.providers=CLDR, Japanese translation was not changed on 2020.04.22 line)
$ LANG=ja_JP.UTF-8 TZ=Pacific/Norfolk ~/jdk-15+6/bin/java -Djava.locale.providers=CLDR tztest1.java
2020.01.22 23:44:44 GMT+12:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.02.22 23:44:44 GMT+12:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.03.22 23:44:44 GMT+12:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.04.22 23:44:44 GMT+11:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.05.22 23:44:44 GMT+11:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.06.22 23:44:44 GMT+11:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.07.22 23:44:44 GMT+11:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.08.22 23:44:44 GMT+11:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.09.22 23:44:44 GMT+11:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.10.22 23:44:44 GMT+12:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.11.22 23:44:44 GMT+12:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2020.12.22 23:44:44 GMT+12:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593
2021.01.22 23:44:44 GMT+12:00 \u30ce\u30fc\u30d5\u30a9\u30fc\u30af\u5cf6\u6642\u9593

C locale's output was fine:
$ LANG=C TZ=Pacific/Norfolk ~/jdk-15+6/bin/java -Djava.locale.providers=CLDR tztest1.java
2020.01.22 23:46:42 NFST Norfolk Summer Time
2020.02.22 23:46:42 NFST Norfolk Summer Time
2020.03.22 23:46:42 NFST Norfolk Summer Time
2020.04.22 23:46:42 NFT Norfolk Island Time
2020.05.22 23:46:42 NFT Norfolk Island Time
2020.06.22 23:46:42 NFT Norfolk Island Time
2020.07.22 23:46:42 NFT Norfolk Island Time
2020.08.22 23:46:42 NFT Norfolk Island Time
2020.09.22 23:46:42 NFT Norfolk Island Time
2020.10.22 23:46:42 NFST Norfolk Summer Time
2020.11.22 23:46:42 NFST Norfolk Summer Time
2020.12.22 23:46:42 NFST Norfolk Summer Time
2021.01.22 23:46:42 NFST Norfolk Summer Time

According to en.xml [1] on CLDR, daylight saving time data was missing.
Also, daylight saving time data was missing on ja.xml [2]

I think fallback feature may not work as expected.
Please check it.

[1] https://github.com/unicode-org/cldr/blob/master/common/main/en.xml#L4017-L4021
[2] https://github.com/unicode-org/cldr/blob/master/common/main/ja.xml#L6833-L6837