z timezone formatting option doesn't formatting as expected

[MR-TechSavager]

Describe the bug
while trying to format a value using z it returns zone offset instead of abbreviated offset

const date = dayjs.tz('2024-12-22T16:21:11+05:30', 'Asia/Kolkata');
console.log(date.format('z')); // Expected: IST
console.log(date.format('Z')); // Expected: +05:30

instead of the above expected OP for z formatting it returns GMT:+5:30

I have tried using advancedFormat plugin too still im facing the issue

Expected behavior

z will be transformed abbreviated offset name correctly according to [(https://day.js.org/docs/en/plugin/advanced-format)]

Information

• Day.js Version [1.11.13]
• OS: [Ubuntu 24.04.1 LTS]
• Browser [all browser]
• Time zone: [ GMT+05:30 IST (Indian Standard Time)]