Results from the transit injection-and-recovery tests performed on the TESS (upper panel) and SSO (lower panel) data to assess the detectability of transiting planets in the LP 890-9 system. Upper panel: we explored a total of 3600 different scenarios. Each pixel evaluated 32 scenarios, that is, 32 light curves with injected planets having different P, R_p, and T₀. Larger recovery rates are presented in yellow and green, while lower recovery rates are shown in blue and darker hues. LP 890-9 b (recovery rate ~60%) and c (recovery rate ~6%) are displayed as red and blue stars, respectively (see Sect. 5.2.1 for details). Lower panel: we injected 6000 artificial planets into the combined I + z-filter SSO light curve. On average, each box in this plot contains 50 injection scenarios with differing P, R_p, i_p, and ϕ. Similarly to the upper panel, we include LP 890-9 b (recovery rate of 100%) and c (recovery rate of 96%) as red and blue stars, respectively (see Sect. 5.2.2 for details).