Hi!
On Miner's Horizon 1.7.0-1.17.1, this error is written to the log many times per tick upon entering the dimension.
Empty height range: [100 above bottom-255 below top]
You can see an example of my logs here, at line 333, where I enter the dimension for roughly 10 seconds: gist link
Since this is the entirety of my log, there is a modlist at the top (starting at line 10).

I'm not sure if this error is indicative of a greater bug or not, perhaps some ores aren't spawning, I'm not sure.
I didn't feel comfortable looking into it; I have an SSD and am wary about excess write operations.

Fixed thanks to ishland's contributions in the next update!