The answer is simple, Discord is not set up to handle Illusion PNGs as they are meant to be handled. You've been lucky up until now. As I said, it doesn't always happen, but it does happen. There was no change in game to cause this, it had a chance of happening even on 3.2, you just never had it happen until now.
That is very much an incorrect statement. There is a difference between not having stuff you count as being something to do and actually not having stuff to do. Some people don't mind that all it is is hopping between animations, obviously, or there never would have been a Honey Select 2. People obviously liked this style of gameplay enough that Illusion noticed and made a sequel. That said, the mods do make the game significantly better.
I'm not even seeing a laptop by that name on their website, only monitors, which alone will not play ANY game. What kind of processor is in it? How much RAM does it have? Does it have a dedicated, meaning separate from the processor, graphics card? If any of these answers are no or an amount less than 8GB of RAM, probably not very well, but it might run.