Yes, that’s quite a little problem and a major difference from traditional Christian doctrine. Thus the claim that the bible has to be “interpreted correctly”, which only the Mormons are able to do, according to them.
Not only that, they teach that the current prophet has the authority to override past prophets...Like with Blood atonement, polygamy, the Adam is God doctrine etc.
They teach the children from a young age to "Follow the LIVING Prophet", but because anything of any import can be changed by a new prophet (all claiming to have revelation from an UNCHANGING GOD)....They would be much more honest to teach and use as a slogan....
FOLLOW THE FUTURE PROPHET.