Dave, it appears the fix for this bug is in LibreOffice 7 (Ubuntu 20.10). You are using Ubuntu 20.04 which has LibreOffice 6.4 and probably doesn't have the fix for this bug.
That's why this is marked as fixed, but also most Ubuntu users including yourself won't yet have the fix. It's still appropriate to keep using this bug to discuss the problem and to request a fix for Ubuntu 20.04 which I will do now...
Dave, it appears the fix for this bug is in LibreOffice 7 (Ubuntu 20.10). You are using Ubuntu 20.04 which has LibreOffice 6.4 and probably doesn't have the fix for this bug.
That's why this is marked as fixed, but also most Ubuntu users including yourself won't yet have the fix. It's still appropriate to keep using this bug to discuss the problem and to request a fix for Ubuntu 20.04 which I will do now...