I have seen thousands of em say that. That includes shopping centers, office buildings, etc.Never seen a deed specify what property interest is conveyed. Leased fee is a property interest; a property subject to long term leases is conveyed as a leased fee interest not fee simple. I don't believe I've ever seen that specified in the deed but that is the reality of the situation.
FWIW, there has been some movement in the legal profession to replace the "mediaval" language of real estate. So, in some places, it is statutory that "warranty deed" means fee simple.
Also, I notice you say leased fee is "long term" leases. The AI makes no such distinction.

