Hello, just updated to 0.9.11, I had two missing underwear to buy from bandit, when I bought them I got the heart icon because the gauge was full, but then when I came back it wasn't there anymore, I am now missing only one underwear (#34) I don't know if I missed it or if it's not in the game yet but I can't see nor use the affinity thing with bandit anymore, same thing with Arthur and Rafaelo, I already bought everything from him and there's no heart icon to get the affinity thing with him, tried this in the morning and evening (Rafaelo is busy in the morning and Arthur is busy in the evening)
but Arthur, Rafaelo and Bandit are still missing the heart icon 
The above was written before what i'm writting now, I had the idea after writing all this to battle one of them and see if it fix the heart thing, I went to Golden Sand and got to battle Bandit, then I went back to his shop and the heart was there
I'm guessing the update need the player to "refresh" the affinity gauge by battling them once to get a bit of affinity point and understand that they're already full ? Posting this so people who come to read this later might have a clue if they got the same issue as me after the update
Edit : I totally forgot about the dicktionnary when I had the idea, but I just tried and renting a room to battle them anytime works too
Liam was showing just fine for me, if it really is a matter of refreshing the gauge by buying something or battling them, Liam's probably the easiest since his beer are available for free, it's harder for character that sell their goods only once and after that you can't buy anything from them if you already bought everything