Hi Tim. Thanks for the answer but I think I didn’t explain about the problem well.
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The difference occurs when I enable / disable the light source cast shadow option, not static meshes
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I’ve checked the AO buffer with visualizetexture console command and it was fine in both states so I thought it has something to do with the scene color blending or other processes.
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Found this issue in 4.4 QA but the screenshots above were taken in 4.7 preview version editor (didn’t modify anything / results are all the same)
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Environment : default empty map /
unbound postprocess volume with AO amount 1.0 /
the only difference between two is LightSource(directional light) casts shadow or not.
The difference is too significant to assume it as just getting weak.
Thanks for the help 