Forge Version: 38.0.16
Flywheel Version: 0.4.0
JourneyMap Version: 5.8.0 alpha 9

When I disabled Flywheel Renderer and remaped by delete map:

When I Enabled Flywheel Renderer and remaped by delete map:

Mod List:

I am the Journeymap dev,
I noticed some weird issues with flywheel when doing some testing. I have not done much for debugging the issue yet.
We read chunks from disk for automapping them, I get a lot of these errors.
Chunk file at [-136, 65] is in the wrong location; relocating. (Expected [-136, 65], got [0, 0])
This error comes from
net.minecraft.world.level.chunk.storage.ChunkSerializer#read line#72.

When I get time and get flywheel loaded up indev I will add more details.

I can't seem to reproduce this, even outside of dev

Though, now that I added optifine the big black squares no longer happen.

I do have the exact same Issue. I am running a Forge 1.18.1 - 39.0.5 Server with Flywheel + Create + Journeymap(5.8.0alpha9) and the exact same problems arise to me and my friends playing on the Server. I can even reproduce this by loading up a single player world. Same Issue

With just create and Journeymap, there seems to be an issue with the Flywheel renderer when we use texSubImage2D.

GL Error in method: texSubImage2D ERROR: 1282 (SUPPRESSED)
OpenGL Error in texSubImage2D target:3553, level:0, xoffset:192, yoffset:128, width:16, height:16, format:32993, type:33639, IntBuffer

Fixed in journeymap 5.8.0 beta4, should be on curseforge shortly.