A Chinese blog has reported that a successor to the Mi 9 Explorer Edition is in the works at Xiaomi. This variant of the flagship phone was styled so as to look as though it had a clear-glass back - however, it was achieved with a decal of sorts. Apparently, its 2020 counterpart is the real deal.
https://www.notebookcheck.net/The-Xiaomi-Mi-10-Explorer-Edition-leaks-out-alleged-to-be-genuinely-transparent-this-time.456615.0.html