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Flickering issue with tree material

Hi there,

I’m having an issue where the tree branches in my scene are creating some flickering artifacts. The artifacts seem to occur where there is another two-sided subsurface material placed in front. (In the screenshot below there is a cloth stall in front of the trees where the flickering issue is occuring - the shading model for the trees is 2 sided foliage and for the stall its Subsurface).

The flickering also occurs on a cloth stall asset but goes away when I build - for the trees though the problem still remains after I build.

For my lighting I have a moveable directional light and the trees have Distance Field Indirect Shadow enabled. My best guess is it has something to do with this as when I turn it off the flickering stops although I need it enabled to create nice shadowing on the trees.

I’m currently in the process of learning lighting in UE4 so there may be something obvious I’ve missed!

Thanks in advance!