Put this in bugs, but apparently that is not the place.
Ok, so I was testing my plat deck and I noticed that it drew 2 cards, didn't play anything, then the next turn it played 3 quanta sources (can't quite remember what it was). This ofc bugged me, because it meant that the 2nd turn it only drew 1 card, instead of the 2.
Loaded up a precog/golden nymph deck to check what was happening, and on the 3rd game I got this:
Exact same scenario as the first one.
In my opinion, this probably has to do with the fact that the ai has an decision making engine that takes into account "suspicious cards". A Xeno (I believe) explained it, it finds cards that were nightmared into its hand suspicious generally not playing them right away (you can see this if you play day traitors, ai won't won't immediately play RoL's). Maybe because its acquiring more than 1 copy of the same card, it won't play them right away.
Going back to look at it more, and the ai will play an upped tower and an unupped pillar.
Still looking at it, found it happen with a single pend, disproving my suspicion theory.
Next game I get this:
Basically, Ai drew pend and immortal, didn't play either (note that it had 8 aether quantum at the end of that turn, didn't play a silence either) then double drew with hourglass to get sow and tower, then ended it's turn, leaving a single card slot to mess up dexterity for next turn -.-. From the looks of it, this is quite common, kinda suprised I'm the first to mention it.
For the record, the ai had not yet drawn with hourglass in the first two examples.