Imported files have first character of name replaced with underscore

I recently updated from a 2017 build of Unity to 2020.1.13f1, and I've noticed the editor inappropriately replacing the first character of file names with an underscore upon importing them into the editor. Two examples:

  • I dragged-and-dropped Sparkle.png into the Project, and the editor renamed it to _parkle
  • I dragged-and-dropped Classes.xml into the Project, and the editor renamed it to _lasses

This is deeply annoying and actively slows down my workflow. It has only happened to me in Unity 2020.1.13f1.

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Existing thread here: https://discussions.unity.com/t/814924

Looks like an editor bug, doesn't seem like it's been patched yet.

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