We show that for a closed embedding $\mathbb{ H}\le \mathbb{ G}$ of locally compact quantum groups (LCQGs) with $\mathbb{ G}/\mathbb{ H}$ admitting an invariant probability measure, a unitary $\mathbb{ G}$-representation is type-I if its restriction to $\mathbb{ H}$ is. On a related note, we also prove that if an action $\mathbb{ G}\circlearrowright A$ of an LCQG on a unital $C^*$-algebra admits an invariant state then the full group algebra of $\mathbb{ G}$ embeds into the resulting full crossed product (and into the multiplier algebra of that crossed product if the original algebra is not unital). We also prove a few other results on crossed products of LCQG actions, some of which seem to be folklore; among them are (a) the fact that two mutually dual quantum-group morphisms produce isomorphic full crossed products, and (b) the fact that full and reduced crossed products by dual-coamenable LCQGs are isomorphic.
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