Inderect light cashe samples outside LightmassImportanceVolume

Inderect light cashe samples are located outside LightmassImportanceVolume. Previously, int the older version of UE4 did not come across a similar problem. Can anyone tell me how to solve this issue?

Similar problem at the forum unanswered: 4.15 Indirect lighting samples not working? - Rendering - Unreal Engine Forums