Describe the bug
The min and max Y heights of a given dimension can vary. This means that the mod might try and place the grave somewhere it cannot (i.e. y-60 in the end or nether).

Forgotten Graves Version
v2.3.1-mc1.18.1

Expected behavior
The mod should get the min/max Y levels for the given dimension and respond accordingly.

Additional context
This has been corrected in commit ca9f1c3 and will be released in the next update (which will include honoring curses as well).

Correction, this was fixed by ca9f1c3.