formatRelative does not work as expected

[Udinei]

Good morning everyone!
Version I'm using:
"date-fns": "^2.14.0",
"date-fns-tz": "^1.0.10",
"react": "16.11.0",
"react-native": "0.62.2",

I came across this problem when using formatRelative:
.....
const tmp = formatRelative (parseISO ('2020-08-18T12: 00: 00.000Z'), parseISO ('2020-08-18T11: 37: 20.000Z'), {
locale: pt,
addSuffix: true,
});

    ....
    expected: today at 12:00
    mast esta return: today at 08:00
  .....

Does anyone know where I'm going wrong or if it's a possible bug?

Thank you in advance!