I completed Chapter 1 until Deadly Life, then reloaded the chapter to do more FTEs using the same save slot. I reloaded to the beginning of Free Time several times, and then decided to do Jett's FTE at the start of Free Time. But after I completed it, the screen turned to black and it stayed stuck like that. I still could move the cursor around, and I heard the sound of cursor hovering over the interactable objects, and I also could open the tablet menu, but I couldn't see anything. I reloaded to the beginning of Free Time and did Jett's first FTE again for several tries, but the same thing happened. A couple of times I pressed some keys on my keyboard, and it got me out of the black screen to the sight of protagonist's bedroom, but then the characters weren't present in the locations for the second part of Free Time. After some trial and error, I got out of this bug by completing Jett's first FTE, then when I got black screen again I pressed the keys by memory, saved to the empty slot, and then reloaded chapter to the start of Free Time. After that everything went back to normal.
My theory as for why that happened is because during the first Jett's FTE location changes to the dining hall, but it may be wrong because I know nothing about coding.
I hope what I wrote actually makes sence, English is not my first language.
Edit 1: The same bug happened with Ulysses's penultimate FTE, the one where he and Damon go to the dining hall to look at the paintings. I got out of the bug the same way.