I have tried a search using find missing files feature for lost files after changing the data directory,
but Blender does not recognize the case-changed files.
To explain the process of the incident,
The name of a file in the original directory was ‘Texture.png’.
The directory has been renamed.
My team member overwrote the file with ‘texure.png’ there. There are dozens of such files.
Blender’s Find Missing Files feature does not recognize case-changed files.
I’d guess that’s the price of Blender being cross-platform:
While some OSs are case-agnostic (e. g. Windows), others aren’t (e. g. Linux). And for the latter “Texture.png” simply isn’t the same file as “texture.png”…
What you should do is define a mandatory file nomenclature within your team (only lowercase etc.) to avoid things like this in the future. For this incident, however, I don’t think there’s an alternative to biting the bullet and fixing this manually (other than perhaps batch renaming the corresponding files).