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Abstract We point out that two models that reconcile the neutron lifetime anomaly via dark decays of the neutron, also predict dark matter-neutron ( χ ¯ $$ \overline{\chi} $$ − n) annihilation that may be observable in neutron-antineutron oscillation and proton decay searches at Super-Kamiokande, Hyper-Kamiokande and DUNE. We study signatures of χ ¯ $$ \overline{\chi} $$ n → γπ 0 (or multi-π 0) and χ ¯ $$ \overline{\chi} $$ n → ϕγπ 0 (or ϕ+multi-π 0), where ϕ is an almost massless boson in one of the two models.