Which firmware are you using on your V5?
I remember having this character (...) in a book I created and it was displayed perfectly fine with the LBook V3 firmware.
I do not know if it worked for me because I use OOOFBTools to create my FB2 files or because of the different CoolReader version.
I do not know much about the different V5 firmwares, but have you tried the LBook one? If it contains the same CR as their V3 firmware, that may improve your reading experience on your V5 reader.
Oh, and we are in an LBook topic, aren't we?