Why turning on the DEBUG option in env_build.xml makes the model running?

Hi, cesm users,
So, I am a little confused about the DEBUG option in env_build.xml and here it is.
CESM1.2.2 can sucessully run in my local cluster with T31_gx3v7 resolution. When I tried to increase the resolution to f09_g16,the model cannot not finish initiazation and stopped after reading gx1v6_region_ids.  However, if I turn on the DEBUG option in env_build.xml, the model can runningwith f09_g16.   (I am using compset B18505CN) Why did this occur? What does DEBUG actully do ?
 Thanks very much Xiao
 
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