Impress Master Slide Background Copy

LO Version: 6.1.5.2 on LMDE 4

I make a set of slides specifying a background image for all the slides using the master slide (Properties>Master View).

If I select these slides and copy them into another Impress presentation, the master slide background image doesn’t copy with the slides into the new presentation. This is annoying.

Is there a way to bring the Master Slide background image along whilst copying slides into a new presentation? Or is there a better way to be applying the same background image to a set of slides instead of assigning it to the Master Slide?