After placing two Spacefarer pirates on the same turn, their effects did not seem to proc in combat. There was no animation, sound, or visual change to their health. However, their healths were equal and both marginally higher after the combat. This combat, notably, was against a newer hero: the one that gets to choose a protoss minion after buying 16 cards. The first action of the game was his minion wiping out a chunk of my board, all of which were pirates with deathrattles. I won this round.
In the following combat, this issue persisted. Each time one of my pirates attacked, the Spacefarers’ health remained visually unchanged. Unfortunately, I was knocked out in this round and I was unable to verify if their health had actually increased behind the scenes as well as if the changes were going to apply after combat.
The active anomaly was the one which duplicates the first card purchased (hence the reason I placed two fresh Spacefarers on the same turn.) My hero was Rock Master Voone.