What happened to the "single thermal"?

In previous versions of Mission Planner (certainly in v1.3.77.1 build 1.3.8301.19586) there was a single thermal about 250-300m from the home position and facing south-west.

In the current version of Mission Planner (v1.3.79.1 build 1.3.8446.16638) it has disappeared.

Is there any way to recover it?