i found one error using texmaths with xymatrix latex library the command /ar[r] put the lines over the second element of the matrix not betwen they. My libre office is 7.0.4.2 over debian 11 linux .
TexMaths is a contributed extension. It is not part of core LibreOffice. You should then contact the author.
The TexMaths home page has a link to report bugs.