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We study the R\'enyi entanglement entropy (EE) of the two-dimensional $J$-$Q$model, the emblematic quantum spin model of deconfined criticality at the phasetransition between antiferromagnetic and valence-bond-solid ground states.Quantum Monte Carlo simulations with an improved EE scheme reveal criticalcorner contributions that scale logarithmically with the system size, with acoefficient in remarkable agreement with the form expected from a large-$N$conformal field theory with SO($N=5$) symmetry. However, details of thebipartition of the lattice are crucial in order to observe this behavior. Ifthe subsystem for the reduced density matrix does not properly accommodatevalence-bond fluctuations, logarithmic contributions appear even forcorner-less bipartitions. We here use a $45^\circ$ tilted cut on the squarelattice. Beyond supporting an SO($5$) deconfined quantum critical point, ourresults for both the regular and tilted cuts demonstrate important microscopicaspects of the EE that are not captured by conformal field theory.

Entanglement entropy and deconfined criticality: emergent SO(5) symmetry and proper lattice bipartition