A new leak speculates that the OnePlus 9E/OnePlus 9 Lite could actually be called the OnePlus 9R. Renowned leaker Evan Blass seems to have dug up the OnePlus 9R monicker from the device's firmware. It is expected to serve as a cheaper alternative for the vanilla OnePlus 9.
https://www.notebookcheck.net/OnePlus-9R-could-be-the-third-device-that-will-be-launched-alongside-the-OnePlus-9-and-OnePlus-9-Pro.524277.0.html