Polynomial derivative causes Prime to Crash?

[compsystems]

3*x^(-2/5) == diff(5*x^(3/5)) [enter] returns 1 (true)

[up] [up] [copy] => 3*x^(-2/5) == 5*x^(3/5)' [enter] returns 1 (true) ok, but shifted the single quotation mark out of the entire expression, in this case not fails, because 5 is taken as constant

should be
[up] [up] [copy] =>3*x^(-2/5) == (5*x^(3/5))'

in the following case fails
diff(x/y) [enter] returns 1/y ok
but
[up] [up] [copy] => x/y' [enter] returns ±∞. BUG CONFIRMED

should be
[up] [up] [copy] => (x/y)' [enter] 1/y ok

FOR HP-PRIME TEAM

solution to bug

diff(expr) => parser as (expr)' and not as expr'


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for Bernard, we would see the solution as we make to naturally

diff(5*x^(3/5) => 3*x^(-2/5) or 3/x^(2/5) and not 3*(x^(1/5))^3/x (is not so simplified superficially)

as you can improve the simplifier?