When a job uses the template-project plugin option "Use SCM from another project" and "Poll SCM" in Build Triggers section the build is only started once.

Step to reproduce:

1. create a job A
2. create a second job B
   1. in Source Code Management section select Use SCM from another project and select the job A
   2. in Build Triggers section select Poll SCM and enter a schedule

Job B starts and use the Job A SCM configuration. After this build, whatever the modifications pushed in the SCM, job B build is never triggered anymore.