our jenkins jobs run as a 'build' user with an nfs mounted home dir

the change of the p4-plugin to start using 'p4 login -a' (we see with 1.12.2) is constantly rewriting the /u/build/.p4tickets files

this causes a LOT of spurious build failures as two jobs conflict and the .p4tickets is not available and a the build will fail out during the SCM step with

Perforce password (P4PASSWD) invalid or unset. 

I know we can work around this by backing the plugin to 1.11.6 but then we lose any new features.
Is there any good reason for using 'p4 login -a' rather than 'p4 login -a -p' to avoid the constant file rewrite?