Go to Chungking.
This is how Chungking looks like on Dec7,1941, scen 100

It has:
15 Engineers
0 Engineer Vehicle
171 Artillery
15 Flak
Now, divide a Chinese Infantry corps into ABC in Chungking.
Now, Chungking screen looks like this.

Arty and flak values dropped to zero. Actually, EVERY SINGLE BASE on the map has its arty/flak values reduced to zero.
Rebuilding the divided infantry corps does not make the values revert to the correct ones.
The effect lasts for the entire turn, and fixes itself at the start of next turn.
I am posting the bug here, beacuse you may be mislead planning your turn, thinking your bases need more flak and arty.
EDIT: This is a variation of 2014 flak/arty bug, which behaved the same way, but involed LCUs. The bug was fixed in one of the patches released in 2014.




