I am not a planetary scientist (my office mate is) and didn't spend much time looking at the literature. "A Revised Exoplanet Yield from the Transiting Exoplanet Survey Satellite (TESS)" by Barclay et al. (https://iopscience.iop.org/article/10.3847/1538-4365/aae3e9) might be the citation you are looking for. Figure 14 shows that anything below 1.5 Earth radii is basically invisible to TESS. I can not find a good chart for the detection limit in the planet size vs star distance plane.