Hello, I am going to post this here in case you don't see a comment I have made previously. I had some issues with the atlas mod, with its supplements and moonlib added functionality. I will list them here.

1, I can not make custom markers as described by moonlib added features.
2, Markers made by banners work as intended. However, beds, campfires, etc. Do not have the correct Icon to the left of the map.
3, I can not delete any markers to the left. I can not delete the icons on the map, or the icons to the left while holding shift. It says, "Delete Marker" but does not actually function. Not even by clicking the red X.
4, I can not highlight a marker to show up on the edge of my minimap.

It seems to me that any feature not exclusively included in the Maps Atlas Mod are not calling to eachother. Not sure whats going on. I wanted to help by loading only these few mods and slowly add my modpack to it until it failed, but I had the issues instantly on a new resource-pack-less modloader. I will list the only mods I have, and the modloader version below. Thank you for your time. the mod is awesome in theory but I can not get it to work correctly. Here's hoping any of this helps. Let me know if there is anything I can do.

Forge 43.4.0
map_atlases-1.19-6.0.4
moonlight-1.19.2-2.3.7
supplimentaries-1.19.2-2.4.20
suppsquared-1.19.2-1.1.1

P.S: I checked one last time, and for some reason it SOMETIMES will show the campfire or bed icons. Very random. I had the same issues without suppsquared btw. I just had it with a second test to see if it helped. It doesn't haha.

you are using 1.19.2. many of the new features should be exclusive to 1.20+ i believe