[v6 General Discussion] Default Theme

I have noticed a bunch of songs in my database (rarely used ones) that do not have a background assigned. If I right click on an image and choose Set As Default Song Theme, will it apply it to ONLY the songs that do not have a custom background chosen?

I know I did set this when we first went to EW6, but it seems some songs did not get it.

No one at EW knows the answer to this?

I am pretty certain it will not change songs with custom backgrounds but would like confirmation before I do it.
If the song does not already have a background assigned to it the it will change to theme that you set as default.
Thanks. That is what I had hoped!