RB750Gr3 Cable Test Not Working?

On RouterOS 6.37.5, I’ve found the “Cable Test” function does not work on the RB750Gr3. I have several, but they are all on v6.37.5, and I’m not in a position to take any down to try other firmware.

Is this a known issue, or something that may have been fixed in a newer firmware?

Thank you, Chris