All "Text" and "Page text" elements in my score changed to another font

Hi! Does anyone know why the font in “Text” and “Page Text” elements would change to something else? (I’m looking for a reason that doesn’t involve the user actually selecting all these elements and voluntarily changing the font using the Score Settings window)

Original (font: Times New Roman)

Broken (font: Rhythms)

What didn’t change:
- Lyrics font (set to a premade text attribute);
- Tuplet font.

Fortunately, I have a backup project and can import the tracks and the exported layout. However, I’d like to know the reason why this happened…