Sending this here because there is not a beastmaster guild:

Currently if you use heel at your mount and then you fail ride underground
which causes your mount to aggro at you, it resets your mounts ID and thus
your heel is no longer accurate. I assume this may be true for other methods
of making your mount aggro to you, although i haven't tested them. Please fix
this, it should not be this way imo. If this is intentional then please
ignore.

Val