Every live save had <mnt a="..."/>, which
LWOMountControlComponent::LoadFromSaveData (0x00bf99c0) reads as the
character's mount item (0 on the 450 saves looked at). The server wrote
no such element.
MountControlComponent now writes it: the item of the mount being ridden,
0 on foot. The saved value is read and kept; nothing is mounted from it,
as riding does not go on over a world change. A save from before gains
<mnt a="0"/> and nothing else in it changes.
Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>