Hey, I believe it could be pretty neat to have configs that handle deaths in lava and falling into void. Potentially death under water.

1. LAVA / WATER

• grave gets destryoed
• grave spawns on the nearest non-submerged solid block
• grave turns the block under it into a solid block
• grave appears right next to the spawn point
• (water) grave appears under water where the death occured

2. VOID

• grave gets destryoed
• grave spawns on the nearest non-submerged solid block
• grave appears right next to the spawn point

• You can configure the mod to drop your items if you die from "tried to swim in lava", using that specific cause of death (check the slightly outdated wiki. I think the death causes there will still work)

• You can remove water/lava from the soft-blacklist of blocks graves are enabled to replace on generation. If not it doesn't match it will iterate outwards from the origin of death until a satisfiable block is found. If no satisfiable block is set, a stricter blacklist will be applied. The working radius for attempted generation can be configured in both x, y and z directions. This is the best I can due to there being no guarantees that a non-submerged block is close-by.

• You can configure which blocks can be replaced with a solid block underneath the grave by datapack tags

• Having the grave spawn next to you on respawn doesn't make much sense to me, since then you could basically just play with keepInventory enabled anyway. If you mean worldspawn however, this is technically doable with the graveyard feature (again, check the wiki), only thing is that it will handle all deaths, and not just the ones where you die in water/lava

• The void has most configurability the same, but due to simplicity, there's a specific config true/false value for generating graves in the void or not.

• You can also configure the mod to generate the grave at the block where your feet last touched the ground.

Some of these configurations are applied with datapacks, some are just plain configs. Do ask again if something is still unclear, or in case you would not agree with my reasoning