Thanks for that, but I just can't find it..
Can another Server owner test this on their Server.
Own a White Horse.. (Horse2), Make sure you log out and in to reset stats.
Get some Boots with around 20 Regen (so you can see HP increase a little quicker)
Get hit.. Check out the Regen
then
Get rid of Horse, Own a Black Horse (Horse4), again make sure you log out to reset stats.
Get hit, and Check out regen again..
Mine is considerably lower.