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What is a non-example of and $(\infty,1)$-topos where disjointness fails?

One of the axioms for $(\infty,1)$-topoi is that the topos is disjoint, meaning that we have the following pullback diagram $$ \begin{matrix} 0 & \rightarrow & A \\ \downarrow & & \downarrow \\ B & \r …