As illustrated in the image below, Lumen AO on trees with dense foliage gets unnaturally dark.
There are similar issues with DFAO, but those can be somewhat mitigated with the “Min Occlusion” and “Occlusion Tint” settings from the SkyLight. I couldn’t find anything along those lines for Lumen and post process settings alone aren’t enough to work around this issue. Even cranking up the sky light intensity does little to lighten the dark areas.
A setting to control the max occlusion would be useful, especially for more stylized games.