Hi, buds.
I actually thought that a choice of plugs at Maslab's stall to buy for Esmeralda's training is a progression-based thing (like buying bigger plugs for former training sessions), so I bought the smallest/cheapest one - little did I know that the game will stick to it and never lets you buy plugs again, neither does it allow you to by all plugs in a single visit (they just disappear after I bought one).
So is it a bug? A work in progress? And does it in any way affect the story other then maybe a dialogue line or two when presenting the toy? Had no chance to check it as previous save was too aged to that moment...