Sorry, I probably should've clarified more info about this. The shows are fully cancelled, in that they aren't waiting to be cancelled at the end of the season. I know that radio and TV shows have to wait to be cancelled, but Internet shows cancel instantly. However the current bug I've found seems to happen no matter which kind of show you use, even after they're all fully cancelled.
To replicate, launch an Internet show and then cancel it after launching. You can now look at your media profits and see it still affects your total profit even though it shouldn't since it's cancelled. You can also check this by adding all the profits of your past/current shows up and comparing it to your media profits to see that even shows cancelled years ago still affect your profits.
I've also now noticed that the shows don't seem to take into account revenue vs budget calculation correctly, which could maybe be related. Basically, all radio and Internet shows will always earn money and TV shows will always lose money.
For instance, when I launch a no host TV show, it has a budget of 100k yen a week. That's all fine. But then it launched, it says it earns 128k revenue initially. The amount of profit I earn from the show should be my revenue minus my budget, so my profit should be 128k minus 100k, which is 28k. Yet, for some reason, the game will say I'm actually losing 128k yen a week from the show, which is a bug for a number of reasons lol. One, it should be 28k affecting me, not 128k. Two, I should be getting plus my profit, not minus my profit (at least in this case where I'm supposed to have profit).
With internet and radio shows though, the budget isn't subtracted from the revenue and the profit isn't turned negative like TV shows are. Meaning that, no matter what, internet and radio shows will always earn money, even when they shouldn't. For example, I have an early internet show that has a 10k budget but only earns 5.6k in revenue. Profit = Revenue - Budget = 5.6k - 10k = -4.4k. So I should be losing 4.4k a week from the show, and if it doesn't pick up enough to ever make a profit then I should cancel it. But what happens currently is the budget isn't subtracted from the revenue and the revenue is just given to me as profit.
This issue mixed with the fact that cancelled shows will still affect your profits means that currently you can make a bunch of internet shows and immediately cancel them after their release (which you can do with internet shows). Since it only needed you and a sales manager to produce, it's really cheap and easy to make. Since your revenue is treated as profit without subtracting budget, even if it's not successful it'll earn you money. And since you'll still earn the profit after it's cancelled, you can keep earning the money without your idols losing stamina to run the show.