When we are using masked plugin with Perforce plugin 1.3.31 or 1.3.34 though the sync happens on the common variable labeling files.
I define a variable P4USR, P4PWD
P4PWD is masked passwd defined in Global Configuration and in Build job we enable the mask plugin checkbox.
The sync happens properly but the labeling fails
Labelling Build in Perforce using ${JOB_NAME}_${BUILD_ID}
16:00:11 <${P4PWD}>: Found unresolved macro at '${P4PWD}'
16:00:11 Build step 'Create or Update Label in Perforce' marked build as failure

However instead of P4PWD if I use unmasked variables there is no problem. I wanted to use the Mask Plugin and majority of jobs are configured to use that.