Distance field shadows have some sort of low res 'box' around them in UE5

Don’t really know how else to word this, in UE4 I spent a lot of time upping the resolution on my trees to make the distance field shadows look halfway decent, in UE5 they’re still visible but inside this sort of ‘shadow box’ that really gets in the way, I’ve looked at everything and all my settings are the same, regenerating distance fields doesn’t change it either

in UE5:

UE4 comparison:


Any known issue or some sort of change that would cause this?