Certain foliage elements won't bake

I have a level with some foliage scattered around it. When i bake the lighting, it tells me that 3 foliages are still missing lighting.

I set the lightmap scale to 4 for all of my foliage and that did not help.

How can i figure out which 3 foliages need to be deleted? Should i just delete all the foliage and start over?

It really bugs me that UE4 has no way to show me which specific elements are not baking their lighting.