James58899 says to YSITD
https://takahikokawasaki.github.io/minecraft-resources/javadoc/forge/1.8-11.14.1.1320/net/minecraftforge/common/ForgeChunkManager.html Forge要force load一個chunk需要先要一個ticket然後才能用ticket去load,然後他說世界被unload時ticket會被儲存,然後世界被load時會將ticket用callback丟給mod讓mod重新去用ticket load chunk或做其他事