Skylight wont work on VDBs since unreal 5.5

In unreal 5.3 skylight can light up dark side of VDB clouds ,but In lastest 5.6 and 5.5 sky light wont impact vdb at all which caused the clouds seems to be much darker than the rest of scene.

Is this an acknowledged bug that’s due to be fixed? or is there a setting I’m missing?