It would be nice if we could activate some setting to show us which chunks are currently loaded in the world map. This would require server-side support. In particular, it would be helpful to see which chunks are lazy and which are entity-processing. This is helpful for technical players who build chunk loaders and perma loaders but probably for map makers as well, when they use /forceload.

Done. Not tested on the server.

Could you add separate colors for redstone ticking vs lazy chunks?

Sorry, but not. The World checks redstone signal for specific BlockPos, including Y coord. I can't checks all over the Chunk for reciving or emmiting redstone signal.

Hmm? I'm not talking about redstone signals. I'm talking about entity processing chunks vs lazy chunks. People often call lazy chunks "redstone ticking" (although I did say "redstone ticking vs lazy chunks" by accident even though they are the same thing).