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Inspired by recent observations of $T_{c\bar{s}0}(2900)^0$ in the $D_s^+\pi^-$ invariant mass distribution of $B^0 \to \bar{D}^0 D_s^+ \pi^-$ decay and$T_{c\bar{s}0}(2900)^{++}$ in the $D_s^+ \pi^+$ invariant mass distribution of$B^+ \to D^- D_s^+ \pi^+$ decay, we investigate the $T_{c\bar{s}0}(2900)^{++}$contribution to the $B^+ \to K^+ D^+ D^-$ decay in a molecular scenario, wherewe consider $T_{c\bar{s}0}(2900)r^{++}$ as a $D^{\ast +} K^{\ast+}$ molecularstate. Our estimations indicate that the fit fraction of$T_{c\bar{s}0}(2900)^{++}$ in the $B^+ \to K^+ D^+ D^-$ is about $12.5\%$, andits signal is visible in the $D^+ K^+$ invariant mass distribution. With theinvolvement of $T_{c\bar{s}0}(2900)^{++}$, the fit fractions of$\chi_{c0}(3915)$ and $\chi_{c2}(3930)$ may be much different with the onesobtained by the present amplitude analysis [Phys. Rev. D \textbf{102}, 112003(2020)], which may shed light on the long standing puzzle of $\chi_{c0}(3915)$as the conventional charmonium.

Searching for the open flavor tetraquark $T^{++}_{c\bar{s}0}(2900)$ in the process $B^+\to K^+ D^+ D^-$