“test”

“Another 吐oo test”

Created (or opened) testoocharacters.odt file with angled double quotes, using both Times and Trebuchet. Saved as RTF, closed, and reopened.
File still looks fine. 

Added <“foo”> (without angle brackets) above. Save/close/reopen. 
Looks fine. Can edit as long as you don't change fonts. 

Changed <Another “foo” > to Arial. Save/close/reopen. Weird characters appear around “foo”