routetree doesn't like folders named 'index'

[dezren39]

Describe the bug
When using pretty-url and I make a folder: index/index/index/index.md
I can access it correctly from the url bar manually,
but the sidebar doesn't send me to the right url.

If I start from the nested file and try to go up 1 parent, I go up 2 parents.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://zettel.developing-today.com/Pages/file/index/index/index/example
2. Click on direct parent 'index'
3. You will land in parent of parent 'test'

Expected behavior
It's kind of silly to make such a folder structure, but I would expect either it would work or the documentation would say "Don't do that."

Additional context
I am in a fork where I've made minor changes I think are unrelated to this issue.

Calling this out just in case I'm wrong.