These were filed on January 3rd. It was inevitable! Will likely see a lot more both on US markets and elsewhere.
https://www.sec.gov/Archives/edgar/data/1396092/000199937124000043/trex15x-485apos_010324.htm
https://www.sec.gov/Archives/edgar/data/1396092/000199937124000045/trex175x-485apos_010304.htm
https://www.sec.gov/Archives/edgar/data/1396092/000199937124000047/trex2x-485apos_010324.htm