Hybrid does apply deinterlacers if:
a. input scan type is not 'progressive' (Filtering->(De-)Interlace/Telecine->Deinterlace/Telecine Settings->Input scan type) or the input scan type is overwritten (Filtering->(De-)Interlace/Telecine->Deinterlace/Telecine Settings->Overwrite input scan type to) to something other than 'progressive'.
AND
b. the chosen encoder does not create interlaced output.
So if your source is interlaced, but wrongly flagged, you should overwrite the input scan type to let Hybrid know how to handle the source.
If you don't want Hybrid to deinterlace and your source is flagged as interlaced, you need to make sure the output encoder is set for interlaced output.
Cu Selur
a. input scan type is not 'progressive' (Filtering->(De-)Interlace/Telecine->Deinterlace/Telecine Settings->Input scan type) or the input scan type is overwritten (Filtering->(De-)Interlace/Telecine->Deinterlace/Telecine Settings->Overwrite input scan type to) to something other than 'progressive'.
AND
b. the chosen encoder does not create interlaced output.
So if your source is interlaced, but wrongly flagged, you should overwrite the input scan type to let Hybrid know how to handle the source.
If you don't want Hybrid to deinterlace and your source is flagged as interlaced, you need to make sure the output encoder is set for interlaced output.
Cu Selur