CPS3 - Red Earth: sprite tiles disappearing during gameplay, mainly on the right side of the screen

[Jefffr]

1. Bug description (main issue)
While playing Red Earth on the JTCPS3 core, some tiles of the characters' sprites disappear during gameplay. The issue occurs mostly on the right side of the screen: tiles of the rightmost sprite become invisible intermittently, with no obvious pattern.

Video attached: shows the disappearing tiles on the right side during a fight.

VID_20260822_110917_compress.mp4

2. Environment
Core: JTCPS3, build jtfriday_260821 (RBF dated 21/08/2026, MD5 70d01ccc1150042057f2f2b093a52473)
Platform: MiSTer FPGA (SuperStation One)
Game: Red Earth / Warzard (Asia 961121, NO CD) — MRA Red Earth (Asia 961121, NO CD).mra
ROMs: redearth.zip (MAME 0282 set)
jtbeta.zip: present and valid

3. Expected behavior
All sprite tiles should be visible, regardless of the characters' position on screen.

4. Observed behavior
Tiles (16×16) of the rightmost sprite disappear randomly during a fight
The issue occurs mainly on the right side of the screen
I did not notice any sprite zooming at the moment the tiles disappeared

5. Secondary issue (not reproducible)
Context: 2nd fight against Kongou (Red Earth boss).

Timeline:

During the fight intro: everything is correct — Leo's sprite (left) and Kongou's sprite (right) render properly
The fight starts and, at that moment, the tiles of both characters get mixed up
The mixed rendering persists for the entire duration of the fight, on both sides of the screen
I don't know if it's a cross-swap (Leo displaying Kongou's tiles and vice versa) or a more random mix
Encountered only once (2nd fight against Kongou), unable to reproduce since. If I reproduce it, I'll take a photo/video.

[Zet-sensei]

I was faster for doing a photo.

Second fight of the game, if you choose Leo.
I can trigger the issue everytime on my system, and it appears after a quick intro against the boss & all during the fight.

If you loose & choose to continue, the metasprites are correct this time during the fight.

[Zet-sensei]

The sprites tiles disappearing on the far right side of the screen occurs also on JoJo's Bizarre Adventure - Heritage for the Future on some stages.

Thanks to Xybur for the initial video capture of gameplay.

[Jefffr]

I was faster for doing a photo.

Second fight of the game, if you choose Leo. I can trigger the issue everytime on my system, and it appears after a quick intro against the boss & all during the fight.

If you loose & choose to continue, the metasprites are correct this time during the fight.

That's exactly the bug I encountered, but I only experienced it once; I'm using a SuperStation One.

[Jefffr]

I tried this core https://github.com/javi-ivaj/cps3-fpga (IA core) on Red Earth, and I don't have any issues with sprite clutter or sprites disappearing on the right side of the screen.