No idea but there are two nomination badges for that year and the second one gives you xp:

https://psteamcommunity.yuanyoumao.com/id/anonhelper/badges/56

The Steam Awards Nomination Committee 2021 Classic Edition was apparently given to all users that had the above badge.

引用自 See you in 3 months：

The award corresponding to Steam Awards Nomination Committee 2021 Classic Edition still has 0XP

Was it intended or a mistake from their end?

It was because everyone complained about the change they made to the design on the other badge.

https://psteamcommunity.yuanyoumao.com/discussions/forum/0/3203744275137434822/

https://psteamcommunity.yuanyoumao.com/discussions/forum/0/3203744275137202655/

Everyone still got their 100xp from that one and the remade badge is 0xp because of that.

It was intentional.