block mit \items drin hat zuwenig Platz vor dem ersten \item

-    152         \begin{block}{Our Goals}
|    153         \begin{description}[widest=No prior connection]
|-   154                 \addfontfeatures{Numbers=SlashedZero}
||   155                 \item[Frame 0] contains payload
||   156                 \item[No prior connection] to Bob necessary
||   157                 \item[Minimal-overhead] central authority
||   158                 \item[Tailored] to tiled architectures
|    159         \end{description}
|    160         \end{block}

Workaround: \vspace{1em} vor \begin{description}