GUI scale above or equal to 3 changes to 2 after reading the wiki book in windowed mode.

To reproduce:

• set the gui scale (in my case I use GUI scale 3)
• set minecraft in windowed mode (not fullscreen windowed)
• open the wiki book
• go full screen windowed and see that the gui scale has changed.

Video:

@CrossVas that happens due to everytime the screen is changing the gui being reset...
Its a real problem with minecrafts guis...