We mods split up the work of who handles which social media platforms -- I'm the one for LJ and DW and Pillowfort, and as soon as I had posted this "reveals bug" info I informed the mod who does Tumblr to make the same post there. Might be something of a time-lag between this post and the Tumblr post because that mod is currently travelling and may have gaps in online time.

As for the part of your question where you wrote "when you actually open the collection for posting works" -- well, the collection becomes open for posting works as soon as assignments are sent out, so it's been open already and that's how we saw that works posted to the collection were affected by the "reveals bug".