A new bug report, likely relates to save states.
As I've loaded the game today and checking through offers of other prisoners, I've hastily closed the game in cell selection menu. After logging back in, the game appeared to display the state of previous day, with all NPCs, bits on the floor and shop stock being in accordance with what they were yesterday before I left (although I've sold my EXEs that day in bank/exchange, so I was still out of EXE and EXE rates went down). Daily reward was also claimed, but otherwise - everything else was as how it was yesterday. I've done prison office before checking through shop stocks, so I basically missed an opportunity to buy any new items in style shop. At the same time, all prison cells got reset as if I haven't cleared them (which I actually did before quick-closing the game). I think it might worth looking into.
Thank you for your report.
However, judging by how you described the problem, it sounds like the game wasn't able to save to disk. Saving to disk often happens when the game closes, even if it is by pressing the X on the upper-right corner of the window. (This is how the game engine I'm using works. Unity)
I will double-check this problem and see how I can improve this. However, I can't make any promises that I can make a fix to this.