The latest patch removes the Corrosion Damage type, but it appears that it is still referenced in the code and will result in a crash upon loading.
"
Failed to load mods: Will-o-the-Wisps-4/data-final-fixes.lua:2: attempt to call field 'set_corrosion_resistance' (a nil value)
stack traceback:
Will-o-the-Wisps-4/data-final-fixes.lua:2: in main chunk
"

This is being loaded in a modpack so let me know if you can't reproduce the issue.

im getting the same issue

Odd issue... it turns out that "zip -r" actually merges new content into an old archive if present.

Should be fixed with the new version.