Intl.DateTimeFormat.format() output has changed since 18.19.1 and no-longer matches Chrome/Firefox (for en-NZ)

[flakey-bit]

Version

v18.20.0

Platform

Linux XLW-5CD9332MDP 5.15.146.1-microsoft-standard-WSL2 #1 SMP Thu Jan 11 04:09:03 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

No response

What steps will reproduce the bug?

const date = new Date(Date.UTC(2020, 11, 20, 3, 23, 16, 738));

console.log(
  new Intl.DateTimeFormat('en-NZ', {
    dateStyle: 'medium',
    timeStyle: undefined,
  }).format(date),
);

Output for Node 18.19.1: 19/12/2020
Output for Node 18.20.0: 19 Dec 2020

NB: Output for Node 20+ is as-per 18.20.0

Chrome/Firefox behave as-per Node 18.19.1 which makes me question whether this is a regression (I'm aware 18.20 included ICU updates).

How often does it reproduce? Is there a required condition?

Reproduces consistently.

What is the expected behavior? Why is that the expected behavior?

Expected behaviour is as-per Node 18.19.1 because that behaviour also matches Firefox and Chrome

i.e. expected output 19/12/2020

What do you see instead?

Observed output is 19 Dec 2020

Additional information

No response

[flakey-bit]

This is quite likely to be related to #52244

[targos]

Yes, it's the same as #52244. Chrome Canary also shows the new format.