Text line disappears if corrupt file by a local time signature
MuseScore v 2.3.2
Open the file "bugreport.mscx" and notice that there is a text line in the two last systems of the score (don't mind the misplacement of the text line, this is a stripped down score just for illustration purposes). Also notice that the XML element is positioned at the beginning of the tag. Change anything on the score with MuseScore and save it.
After saving, notice that the XML element will be repositioned from the beginning of the tag to between two elements. If you re-open this saved score with MuseScore, the text line will be not be displayed anymore!
(The attached file "bugreport_saved.mscx" illustrates the state of the file after having changed a note pitch and saving it.)