You are correct. It seems to remove all variations of the + symbol when saving the report.
Only workaround I found was to use character map and copy the ±± ┼┼ symbols in the name.
±± ==> Alt-0177
┼┼ ==> U+235C
Using the Arial tables. You can search for others, but at least it's somewhat like what you're looking for. Attached is an image of what it looks like using both for reference.
![Notepad ±± ┼┼ Software Installed — Mozilla Firefox.png Notepad ±± ┼┼ Software Installed — Mozilla Firefox.png](/t5/image/serverpage/image-id/4618iF2A8E7A7D1C0F9C8/image-size/large?v=v2&px=999)