Screen Boundary causing issues - Yoshi's Island Hacking

For some reason whenever I place any tile at all into 7A, the level refuses to load up in-game. I thought maybe I had hit some sort of limit, but then I moved the tiles into the following boundaries, and the level loads just fine. I'm not sure what the issue could possibly be and I dusted off this account I havent used in 6+ years to see if anyone knows the solution.

What does "refuses to load up in-game" mean? The game freezes on a black screen when you enter the sublevel?

If so, I know of two major causes of that:
- the sublevel uses more than 63(decimal) different screens, i.e. about half of the 128 total screens
- an object extends out of bounds vertically (above the top or below the bottom of the sublevel)

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Advynia: a Yoshi's Island editor - Alyssa's Unlikely Trap demo 3

Originally posted by Karisa

What does "refuses to load up in-game" mean? The game freezes on a black screen when you enter the sublevel?

If so, I know of two major causes of that:
- the sublevel uses more than 63(decimal) different screens, i.e. about half of the 128 total screens
- an object extends out of bounds vertically (above the top or below the bottom of the sublevel)

Yeah, that. I enter the pipe that leads into that sublevel and it just stays on a black screen, music still playing. I guess it must be the former issue, because I checked beforehand to make sure no objects were going through the boundary. Oh well. I just don't get why it works fine if I place more tiles in any screen but 7A.

To get back to Karisa's first point: Does this happen if you place anything on any other empty screen (and use them up)? Because if that's the case then you indeed use too many screens in your sublevel.

I'm honestly surprised to see somebody run up against the screen count limit. Are you sure you aren't using any screens by mistake, such as by placing extended object FE in an empty screen? Your level has to be absolutely huge for this to happen otherwise.

I recommend splitting your stage into multiple sublevels if you can.