Apart from the issue of line formatting of plain text in the new Unicode contact form <https://support.unicode.org/osticket/open.php>, it appears that some pretty innocuous characters such as the vertical bar | or the degree sign ยฐ are getting stripped out from the latest reports, in <https://www.unicode.org/review/pri526/> for instance.
Ironically enough, it seems that the Unicode contact form is not Unicode-conformant/compliant then. Maybe some kind of "Make ASCII Great Again" thing?