An update has just been released for Maple 2024 that solves the problem of some of the matrices' elements being turned into dots, and that, for example, equivalence symbol disappears when exporting to PDF.

Therefore, install the update as soon as possible to avoid problems for exams, where you must submit in pdf-format!

This is simply done by going to "Tools" in Maple, where at the bottom you select "Check for updates".