I had seen it and I tried every steps. No, still no. I want to say my problem is a little different and worse. My map mod doesn't disappear when I get closer, instead I can not see and just like the map dlc doesn't load. Also came the worst thing, that is after I install San Andreas DLC, my game over, RAGE Plugin Hook failling hooking my game, when I reset game, RPH still can't hook my game. Really bad and I was so angry.

Uh... I have done everything, why my map mod still disappears. Are there any ways else?

One possible way is to remove gta5.exe not completely delete, then restart PC and get exe back when start the game. If launcher can be online then go to the C: documents find Rockstar Game fold and delete the launcher fold. Close the game completely and try it again. This may be helpful.