Ŝia nomo estas Noel
Mi havas revon pri ŝi
Ŝi sonas mia sonorilo
Mi havas gimnazio klaso en duonhoro
It accepted "Ŝia nomiĝas Sofia" but said that "ŝia" should be "ŝi". Is this an error?
Sxia is a possessive pronoum.
Sxi is a subject.
I don't suppose you have a screenshot from this issue in December 2019. I can't imagine why it accepted it - unless the system let it through as a typo.
I have seen it before, but not the reason for it: does (in this case) Sxia mean the same as Sia (can't write the correct marks on the letters)? Or are those totally different words?