Originally Posted by
Grekumah
As part of a quality of life improvement in Patch 2.5 we made it so when interacting with objects that feature actions (such as the cannons found inside Castrum Meridianum) the abilities would automatically appear on your hotbar/cross hotbar, instead of being displayed exclusively on the pet hotbar.
However, as you pointed out, we have confirmed that this change is happening to mounts as well. We are planning to address this issue and we will update you as soon as we hear more!