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I deleted the collision between every single capsule and sphere just to be sure. It still spazzes out and explodes on the first frame.
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I tried disabling gravity on the hair, it definitely still spazzes out on the first frame, just doesn’t fall towards the ground afterwards as expected.
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I generally have 10 frame handles at the start and end of my sequences, just in this case the effects of the explosive hair are lasting almost 100 frames before it settles down and behaves normally again. I suppose worst case scenario I can give the sequence 100 frames for the hair to calm down and just cut that out in post.
The thing that is strange is the hair was working fine yesterday. I have a suspicion the new version of Unreal (4.26.2) is in some way related to this problem since I finally updated to it last night and the problem started when I fired up the project today.