Resolved Lightmap Error

I generate lighting for my subscene in Subtractive lighting mode.
It seems normal in Editor，but all my rockes except trees turn to black in subscene mode.

While checking the Frame Debugger，I found that rockes' unity_Lightmaps is default value in subscene mode，instead the value in Editor mode.

Note it that the rock shader uses
#pragma multi_compile _ LIGHTMAP_ON and
#pragma multi_compile _ MIXED_LIGHTING_SUBTRACTIVE，
while the tree shader don't

 

All That goes well when I Add
[HideInInspector][NoScaleOffset]unity_Lightmaps("unity_Lightmaps", 2DArray) = "" {}
into my shader.
(It's all right in Editor mode,why no lightmap in subscene without the property above.-_-)