MCPE has a black screen and huge lag (50 fps to 3 fps) when turning on the new deferred techincal preview

Minecraft pocket edition on the lastest beta/preview has massive lag and a black screen when turning on deferred technical preview even after having met the requirements.

Link of vid because 10 mb requirement:

https://drive.google.com/file/d/16FShKAEhw82EcTZWo8Dt2nrSWuNsilWI/view?usp=drivesdk