The new reprint for avengers tower dropped the avengers keyword from the trait. Is this an errata to the card or a misprint? I just wanted to know cause of the use you could have with team building exercise

It is a misprint:

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Q: In the Rise of Red Skull box, Hawkeye’s prebuilt deck has a copy of Avengers Tower that does NOT have the Avengers trait on it. The previous version of Avengers Tower does have the trait. Which version is correct/was this card errataed? Thanks!

A: There was no errata. It is an unfortunate typo. Both versions should have the Avenger trait.

-Caleb

Source: https://hallofheroeslcg.com/official-ffg-rulings/