What is the real value of the ratio $R=\varphi \to K^{+}{K}^{-}/K_L^0{K}_S^0$?

Branching ratios $\mathrm{BR}(\varphi \to K^{+}{K}^{-})$ and $\mathrm{BR}(\varphi \to K_L^0{K}_S^0)$ are regularly updated in the Review of Particle Physics by the PDG group, and from their 2022 values one finds $R=\varphi \to K^{+}{K}^{-}/K_L^0{K}_S^0=1.448\pm 0.023$, in disagreement with theoretical estimates. To provide new clues about this discrepancy we extract the value of $R$ from recent cross section measurements of processes $e^{+}{e}^{-}\to K^{+}{K}^{-}$ and $e^{+}{e}^{-}\to K_L^0{K}_S^0$. We achieve this by a common description of both charged and neutral data by the Unitary & Analytic model. This new analysis leads to the value $1.553\pm 0.040$ for $R$, which is significantly larger than the value from PDG 2022 branching ratios, and in a relatively good agreement with theoretical estimates.