I did.
https://us.forums.blizzard.com/en/wow/t/mounts-bugged-in-ring-of-champions/858831
The other one already had a report in so I just commented.
However, I have yet to see making a bug report be anymore effective than complaining here.
When I unsubbed in the October, they asked me fill out a questionaire and I was directed here.
Just because it is not your experience does not mean it does not happen.