At this time ESP will need to be restarted to enable the OPE/MVS heartbeat.
Permanent resolution APAR TR94751 to be published as RO94751
This PTF provides an option to Enable and Disable the Heartbeat using commands.
You can use a modify command. This will need to be performed on master and proxy systems.
MODIFY Command from system console or SDSF.
F ESP,OPSMVS ENABLE(Y|D)