Possible bug? \setbeamercovered{invisible} vs. transparent within align* environment

Question

I'm having some troubles typesetting my equations. I want to be able to uncover them one line at a time, while keeping everything that is on the slide transparent until they are uncovered.

Besides the whole "transparent" thing, if I insert "\setbeamercovered{invisible}" into the code it works perfectly. However, if I change this to "\setbeamercovered{transparent}", some weird things start happening... I've linked a PDF of the output for each case on the odd chance that it's a problem with my compiler.

If I replace \onslide<#-> with \uncover<#-> it gives the exact same output in both cases.

Here is the transparent overlay.

Here is the invisible overlay.

\begin{frame}

\setbeamercovered{invisible}
\scriptsize

Then taking the second derivative:\\

\begin{align*}
\onslide<2->{\dfrac{d^{2} u}{dv^{2}} &= \dfrac{d}{dv} \left( \dfrac{df}{dv} y \right) + \dfrac{d}{dv} \left( f \dfrac{dy}{dx} \dfrac{dx}{dv} \right)\\ }
\onslide<3->{&= \Big( \dfrac{d^{2}f}{dv^{2}} \Big) y + \dfrac{df}{dv} \left( \dfrac{dy}{dv} \right) + \left( \dfrac{df}{dv} \right) \dfrac{dy}{dx} \dfrac{dx}{dv} + f \left( \dfrac{d}{dv}      \dfrac{dy}{dx} \right) \dfrac{dx}{dv} + f \dfrac{dy}{dx} \left( \dfrac{d}{dv} \dfrac{dx}{dv} \right)\\}
\onslide<4->{&= \dfrac{d^{2} f}{dv^{2}} y + 2 \dfrac{df}{dv} \dfrac{dy}{dx} \dfrac{dx}{dv} + f \dfrac{d^{2} y}{dx^{2}} \left( \dfrac{dx}{dv} \right)^{2} + f \dfrac{dy}{dx} \dfrac{dx}{dv} \dfrac{d}{dx} \left( \dfrac{dx}{dv} \right)\\}
\onslide<5->{&= \dfrac{d^{2} f}{dv^{2}} y + f \left( \dfrac{dx}{dv} \right)^{2} \dfrac{d^{2} y}{dx^{2}} + \dfrac{dy}{dx} \left[ 2 \dfrac{df}{dv} \dfrac{dx}{dv} + f \dfrac{dx}{dv} \dfrac{d}{dx} \left( \dfrac{dx}{dv} \right) \right]\\}
\end{align*}

\onslide<6->{
Assume:\\

\begin{equation*}
v = \int^{x}_{a} \sqrt{\dfrac{r}{p}} dx^{\prime}, \qquad \Rightarrow \qquad \dfrac{dv}{dx} = \sqrt{\dfrac{r}{p}}, \qquad \Rightarrow \qquad \dfrac{dx}{dv} = \sqrt{\dfrac{p}{r}}
\end{equation*}}\\

\end{frame}