Thank you for this fix! It missed my attention when I was working on custom cellphone mod.
However, it's not true that handheld game is coded properly. In unmodded game Sim B receives additional game when Sims finish playing hadnheld games together. What's more interesting, it only happens to some Sims. Moreover, when Sim A asks other Sim to play together and Sim B refuses, Sim A won't hold handheld game in their hand, even though animation looks like they should be holding it and then the game is deleted from Sim A’s inventory. I fixed these two issues.