This is fundamentally incompatible to the --name option of git submodule add.

Consider

git submodule add --name one ./ two
git submodule add --name two ./ one
git delete-submodule one

or

git submodule add ./ one
git mv one two
git submodule add --name anotherone ./ one
git delete-submodule one

And no, this is not an academical problem.

Recommendation:

Remove this line, as removing something below .git/modules/ can be considered harmful to the history and git bisect.

See https://stackoverflow.com/a/59034242/490291