Sega CD - Chuck Rock game freezes in intro

[KamiLordus]

The game freezes at the beginning of the intro. You can hear the narrator and sounds, but the animation is stopped.

Windows 11
Retroarch 1.18
Genesis Plus Gx core latest
Chuck Rock (USA) - chd file format

Retroarch log file:
retroarch.log

[ekeeke]

I can confirm this is a regression introduced by commit 47761b9

Most probably, this was working by chance in earlier versions but above commit slightly modified main-cpu execution timings just enough to break synchronization between main-cpu and sub-cpu. I will need to analyze this further.

Note: I also noticed that since this other commit (dd61951), that game (and maybe others from Sony Imagesoft which share same boot routines) was taking much longer time at the Sega logo so this is another thing to lookup.