Twice in the last week I've had an item drop randomly spawn right on top of me while running the Explore Delta Volanis Cluster mission. Once it was in sector space and the other it was on a ground map, but was the same shape as a space item drop. I grabbed the item both times and both times it yielded a One Hour Skill/Experience Boost (I'm unsure if it was skill or experience, but the icon is the same as the one for the One Hour Skill Boost on the wiki) as the wiki states that these items are no longer available I've not used them, and while I haven't experienced any bugs from picking them up I have no idea what effect attempting to use or discard them will have.
Please advise. Is this simply a part of normal gameplay that I haven't experienced before or is it a genuine bug?