Beauty quark production in heavy-ion collisions is considered to be one of the key measurements to address the flavour-dependence of in-medium energy loss in heavy-ion collisions. On the other hand, the measurement of the production of strange beauty mesons can provide fundamental insights into the relevance of mechanisms of beauty recombination in the quark-gluon plasma. In this talk, CMS results on the nuclear modification factor, $R_{AA}$, of fully reconstructed $\mathrm{B}_{s}$ and $\mathrm{B}^{+}$ mesons as a function of transverse momentum at $\sqrt{s_{NN}}=$ 5.02 TeV in PbPb collisions will be presented for the first time. The $R_{AA}$ double ratio between $\mathrm{B}_{s}$ and $\mathrm{B}^{+}$ will also be presented.