Hi Vikings!
I am just updating this thread with regards to my post on the 2nd December. I confirmed that the development team were unable to reproduce this issue on update 1.6.2. However, after looking into this further I can see that this was only the case when they did not have the Dawn of Ragnarok expansion installed, therefore it appears that the issue is still present and will occur when using any mount that is not a horse or stag in England.
The development team has confirmed that they are unable to continue looking into a potential fix for this particular issue as they must focus on issues that have a comparatively higher impact on the gameplay experience.
I understand that this is not the outcome you were hoping for and can only apologise.
As the issue will no longer be investigated, I will now lock this thread.