Campfire doesn't work if default class identifier set

I’m not sure if this is a bug or a feature but I can’t seem to be able to use the campfire if I have set the default class identifier in the island settings.

If you want to replicate, do this:

  1. Make a very basic map
  2. put in the campfire instance
  3. run the game, you can light the fire
  4. Go back, change the default class identifier to “class slot” and select any index (doesn’t seem to matter)
  5. Run game, you can’t light the fire now

Why does this happen? Is there any way to change the default class identifier and still be able to light the campfire?