InvalidDate with using CustomParseFormat in FireFox

[MfeaR]

Describe the bug
Invalid date in Firefox.
So, I have a date 2021-09-22 12:25:10 +0300, I parsed it by using CustomParseFormat
dayjs('2021-09-22 12:25:10 +0300', 'YYYY-MM-DD HH:mm:ss ZZ').format()
In Firefox I got "Invalid Date"
https://codesandbox.io/s/dayjs-firefox-invali-date-zdv62?file=/index.html

Next. I opened dayjs site in firefox and call this function in console. It's working!

Expected behavior
Correct working with CustomParseFormat in firefox

Information

• Day.js Version 1.8.21

• OS: MacOs 11.5 on Apple M1

• Browser FireFox 93.0.0 (and Firefox Developer Edition 94.03b)

• Time zone: GMT+3:00 (Russian, Moscow)