Nitpick: I think all these translation files should have the line sorted alphabetically. Tools like https://github.com/minetest/minetest/blob/master/util/mod_translation_updater.py do this internally and sorting gives a defined order to check against and makes it easier to locate a particular string in the file.
Why are you adding a special case for doors in the oxidation API? I think a better option would be to use a general purpose hook so this logic is inside the door nodes.
Since I saw this and was already look at the autogroups mod for #4225 I quickly threw a counter into overwrite(). As of writing, the master branch has 2531 blocks registered.
Thinking on this a bit more, I probably need to limit the vertical distance from the goal position checked so the number of blocks isn't excessive with the larger volume.
This is now done.
With this PR, mobs will now spawn beyond 32 blocks in very small quantities, as mentioned in MineClone2/MineClone2#859