Repro:

1. Download and open the attached repro project: here
2. Open the Scene LightmapContinuousRefresh.unity
3. Ensure that the GO "Plane" has a Realtime lightmap by completing a bake. Does not need Auto
4. Select the Plane
5. Interact with the Editor by tumbling the Scene view, moving the mouse etc.

Observed:

As shown in the attached video, the Realtime lightmaps for the Plane object will continuously refresh, which moves the UI elements below up-and down. This makes interacting with the Inspector, and Material panel, very difficult.

Expected:

Realtime lightmaps should not update unless there are changes made to Scene lighting.

Notes:

Probably the "Realtime Lightmap" preview area should also be a minimum size of 1 lightmap "tile" (blank when unpopulated) so that lower UI elements are not continuously moved about when it is cleared?