Why LibreOffice uses Noto Serif for the missing Aptos?

Aptos font is not present in the system. The LibreOffice's "Apply replacement table" is off.

$ fc-match aptos
NotoSans-Regular.ttf: "Noto Sans" "Regular"

Yet Writer definitely renders text in Aptos using Noto Serif (not Sans). Why? What defines this choice? **UPDATE**: Tested a bit more... it's actually worse than that. Writer renders one Aptos line in serif, another Aptos line in sans. The original file comes from MS Office and is a DOCX, but the effect stays even after saving it as ODT. On the sample below, the font dropdown states "Calibri" for the row 3, and "Aptos" for the rows 1 and 2.