I can confirm this; happens to me as well. Interestingly, I've had no problem redeeming games from earlier HIBs on Steam for Linux.
Oh, and attempting to redeem the key a second time causes the "you already own this product" complaint to appear, but despite saying "press Next to install ..." there's only a (greyed out) <Back as well as a Finish button to choose from.
While the game does not appear in the client when it is added, it does appear the next time steam is launched.
I had no problem with redeeming my HIB codes, but it was before Steam updated itself to the newest beta build - maybe it's related to the appcache bug which is present since the latest beta build?
@WindohsCrasher the time line is off, this issue cropped up well before the appcache issue. I saw a screenshot near-identical to johndrinkwater's before the humble indie bundle 9.
Yes, it appears after restarting the client. Not adding the game in the library, and showing nothing in the activation window imo is more than minor.
Has anyone seen this issue with an up to date client?
Closing pending feedback.
Nothing extracted yet.