MOHAWK: Riven: Trapping self in trap book results in ending videos beginning prematurely

[jyudoki]

When trapping yourself in the trap book (in either Riven, 233 or Tay), the corresponding ending movie plays immediately upon clicking the trap book window. The linking sound effect is also played simultaneously with the ending video audio since the video begins too soon.

In the original, the linking sound plays to completion over a black screen, before the ending video begins. This gives the correct impression that time has passed between the player trapping themselves and when the book is opened by another.

See video here and compare with behaviour in scummvm using save file attached: ​https://www.youtube.com/watch?v=G6Jylqzx3Pk

scummvm version 2.8.1 stable release
Riven GoG or Steam version
Windows 11