Problem with Metal Slug and Action Replay Plus 4M

Don't know why the sprites poofing issue is there in Pseudo's compatibility page

Pseudo v6.274, the Rev A v1.005 Metal Slug which I maybe read would use the RAM expansion but not the last version of this title? But do I know if my added RAM is working er would the game even boot without the expanded RAM?

I paused for a quarter hour.. all swell then even like 45 minutes and no issue here

Model 1 NTSC-U