Steps to reproduce:

Take Mobile Lantern, and open device in app.

Locate the "Headers which say "All", "Zone A", and "Zone B".

Select "Zone A".

Select a light mode. For my testing I selected Christmas.

Now select "Zone B".

Select a noticeably different light mode. For my test, I selected "Ocean".

Expected behavior: One lighting zone on the Lantern would be lighting up per the Christmas dynamic lighting setting, while the other lights up per the Ocean dynamic lighting setting.

Observed behavior: The entire light took on the behavior of the Ocean dynamic lighting setting. An error appeared which read: "Unknown issue occurred. Something went wrong, please try again."

Further experimentation showed that both Zone A and Zone B affect both zones, as if all three of them behave as "All".