Remove tag can leave an empty folder in refs/tags

What steps will reproduce the problem?

1. Explore ".git/refs/tags" and verify that no folder named "Test" exists.
2. Create a tag named "Test/Tag"
3. Use Tortoise Git to remove the tag "Test/Tag"
4. Explore ".git/refs/tags"

What is the expected output? What do you see instead?

Expected: The folder 'Test' should have disappeared. Instead: The folder 'Test' is still there and is empty.

What version of TortoiseGit and Git are you using? On what operating system?

TortoiseGit version 2.6.0.0 Git version 2.18.0 Windows 7 or whatever

Please provide any additional information below.

Using the command line "git tag -d Test/Tag" the "Test" folder is deleted.

It's necessary to remove the folder to be sure that subsequent tag in the same directory are not case shuffled. Here the step to drive a dev crazy.

1. Create a tag named "TEst/tag"
2. Notice you made a mistake because you wanted it named "Test/tag"
3. Remove the tag named "TEst/tag" (at this point the folder still exists)
4. Create a tag named "Test/tag" (the tag is put in the existing folder, that it: "TEst")
5. Notice that the tag you just created is named "TEst/tag"
6. Go to point 3 until craziness.