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Transformation Rules via AlgebraicRules


Can someone explain the following result.  I thought I would get the same 
result using rule1 and rule2 below.

     rule1 = x->t^(3/2)
     rule2 = AlgebraicRules[x==t^(3/2),{x,t}]

     exp = x^(5/4) + x + x^2 + x^3 + x^4

(1)     exp/.rule1
(2)     exp/.rule2



   (1) gives the desired result....

           3    15         9
           -    --         -
           2    8     3    2    6
Out[184]= t  + t   + t  + t  + t

while (2) gives


                                                    1
                                                    -
                    2    3    4                     4 5
General::newv: x + x  + x  + x  + `private`$AuxVar[x ]
        involves variables not among {x, `private`$AuxVar[Sqrt[t]], t}.

                             3
                             -
                             2
Replace::rep: {t -> t, x -> t } encountered where lhs->rhs expected.

etc.,etc.   






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