Thank you to SamW on Discord for getting in touch who had strange behavior when updating from v2 to v4.
First release of 2020 (on January 2nd), 433 stars at time of release (13 up since v4.0.0).
Changelog
Introduced consistent site title text color behavior.
If you do not use the logo, what color should the site text color be?
Add headerTextColor: white or headerTextColor: black under .Params.