Lighting inside group not copied between files

Unfortunately Rhino 7 still doesn’t support lighting in blocks. Bummer, but I thought I could get away with named groups by grouping a block with lighting.

I just found out that when I copy all those groups from a file to a different file, by selecting ‘SelName,’ lighting inside the group doesn’t get copied. I heard that Group in Rhino is a merely a combined selection. Why would lighting get left behind even though it’s inside the selection, not a block?