ZTP generated ptp GM config always contains the interface placeholder as the key cannot be overridden from PGT (only value can).  

      plugins:
        e810:
          enableDefaultConfig: false
          pins:
            $iface_master:
              SMA1: 0 1

Issue in ZTP source-cr: https://github.com/openshift-kni/cnf-features-deploy/blob/a9f827074e833d8d3ed40079b373d418d6877fd3/ztp/source-crs/PtpConfigGmWpc.yaml#L23

4.14

100%

1. install 4.14 spoke cluster via ZTP, with grandmaster config in user PGT
2. Wait for installation to complete
3. Check ptpconfigs on spoke

$iface_master is included in the actual ptpconfig on spoke.
      
      plugins:
        e810:
          enableDefaultConfig: false
          pins:
            $iface_master:
              SMA1: 0 1
              SMA2: 0 2
              U.FL1: 0 1
              U.FL2: 0 2
            ens3f0:
              SMA1: 0 1
              SMA2: 0 2
              U.FL1: 0 1
              U.FL2: 0 2

      plugins:
        e810:
          enableDefaultConfig: false
          pins:
            ens3f0:
              SMA1: 0 1
              SMA2: 0 2
              U.FL1: 0 1
              U.FL2: 0 2

Workaround: use custom source-cr with interface hardcoded in source-cr, or with the plugins.e810.pins excluded from source-cr, but added in PGT.