<author> tag is rendered as "author author" for authors with only a single name (<first author> is rendered as expected)

[samadhi-spice]

When the <author> tag is used in file/folder naming, if the authors name consists of a single word, the authors name is incorrectly rendered as 'author author'. However, when the <first author> tag is used, the authors name is rendered correctly.

I also checked the <narrator> and the same issue occurs. Again <first narrator> renders correctly.

Error reproduces with these single author books:
https://www.audible.com/pd/B07L8MBCLT e.g. tag is rendered as "Vivekananda Vivekananda". It should be "Vivekananda"
https://www.audible.com/pd/B002V8HO8K e.g. tag is rendered as "Ovid Ovid". It should be "Ovid"
https://www.audible.com/pd/B0CQDKF2V8 e.g. tag is rendered as "Jaiya Jaiya". It should be "Jaiya" (This book was used to test the narrator)

Platform
Windows 10
v11.1.0