CCS6.1 cannot display global static variables in debug mode

Hi:

I using CCS(6.1) with SensorTag(cc2650),

when debug mode  , global static variable cannot showed in expressions window,

but the "non-static" variable is show correctly.   

please see below:

Is this a bug in CCS?

my debug tool is CC-DEVPACK-DEBUG(XDS110)

Regards,Colter