GBA Video on Chinese multicart

[onfy]

This is a bit of a niche one. I have one of those 369 in 1 batteryless multicarts, and most of what I've tried on it so far has worked pretty well. With the strange exception of (what I've termed) "v1" Majesco videos. (I've been trying to hack them to make them work on stock GBP, so I've ended up documenting the differences between them a bit. The later ones have different code and they do work, so do Pokemon and Lizzie McGuire, which are from different developers. [Lizzie isn't even an official GBA video.])

When you load one, it appears to work at first, but goes to a black screen after the Majesco logo and stays. I wonder if anyone can figure out why only these do this and only on this type of cart.

Here's a list of the v1 GBA videos for reference:
All Grown Up! - Volume 1
Cartoon Network Collection - Volume 1
Codename - Kids Next Door - Volume 1
Dora the Explorer - Volume 1
Nicktoons Collection - Volume 1
Sonic X - Volume 1
SpongeBob SquarePants - Volume 1
SpongeBob SquarePants - Volume 2
Strawberry Shortcake - Volume 1
Teenage Mutant Ninja Turtles - Things Change
The Adventures of Jimmy Neutron Boy Genius - Volume 1
The Fairly OddParents! - Volume 1
The Fairly OddParents! - Volume 2
Yu-Gi-Oh! - Yugi vs. Joey