h264_cuvid -deint 2 - scene changes are droping frames

Hi

I am transcoding 1920x1080 50i to 1280x720 50p. I want to use deinterlacer and scaller from h264_cuvid ( -deint 2 -resize 1280x720), but it drops frames when the scene in video is changing ( for example: wide scene to detail or back ). When I use deinterlace and scale filter (scale=1280:720:interl=1,yadif=1:0:0) from ffmpeg, it works OK, but it takes more CPU power.
Does not matter if the deint value is set to 1 or 2. ( example of error message: *** dropping frame 1751 from stream 0 at ts 1884 )
I tryed CUDA 8 (+ nvidia 384) and CUDA 9 ( + nvidia 390 ) od Debian 9 ( Quadro P2000 ) but without effect.

my ffmpeg version N-89973-g651d5f9 built with gcc 6.3.0 (Debian 6.3.0-18) 20170516

ffmpeg -nostdin
-gpu 0 -hwaccel cuvid -c:v h264_cuvid -deint 2 -drop_second_field 0 -copyts -start_at_zero
-analyzeduration 20000000 -loglevel 40
-i “udp://@$INPUT_IP:$IN_PORT?sources=$INPUT_SOURCE&fifo_size=160000&overrun_nonfatal=1”
-enc_time_base “1/50”
-c:v h264_nvenc -gpu 0 -b:v 3M
-profile:v high -preset slow -cbr 1 -bf 2 -no-scenecut 1 -strict_gop 1 -forced-idr 1
-c:a:0 libfdk_aac -profile:a:0 aac_he -ac:a:0 2 -b:a:0 64k -ar:a:0 48000
-f mpegts -muxrate 3500k
-y output_file.ts

Hello there,

Please change -drop_second_field 0 to -drop_second_field 1.