I have installed yesterday the test version which can be found on RE: LE 10.0.1 / Rpi4 / No picture after update from LE 10.0.0 (be aware its a test version and not considered a stable one)
It includes a working de-interlacing , and after about 5-6 hours of using on 2 RPI4 setups it working great.
Great work everyone , and waiting to see this on official 10.0.2.
I stayed on the version 9.x because of the missing deinterlacing ... with this development version I switchted to 10.x about a week ago ... no problems until now. Nice work! 