Fresh install. Zero config modification. About 75% of rooms were missing spawners and chests.

Thanks for letting me know. This is a common report and definitely an issue inherited from the original fork.

I've created a wiki page for FAQ. Please let me know if it addresses your issue.

As well, some dungeons use the room type corner which specifically is an empty room without a chest nor a spawner. In this case, it sounds like this is not the issue you're experiencing.

@SandwichHorror This should be resolved with v2.1.2.

Although, any already-generated dungeons will unfortunately not be fixed retroactively.

Fixed in release v2.12.2