[HELP] How encode 8bit to 10bit correctly?

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Hello. How encode 8bit Blue-Ray to 10bit correctly?
I open remux.mkv file, choose High10@5.1 profile, set Calculation precision to 10bit. Here is what I got in CLI:

x264 --preset placebo --crf 18.00 --profile high10 --level 5.1 --ref 4 --vbv-maxrate 720000 --vbv-bufsize 720000 --sar 1:1 --range tv --colorprim bt709 --transfer bt709 --colormatrix bt709 --demuxer raw --input-res 1920x1080 --input-csp i420 --input-range tv --input-depth 10 --fps 24000/1001 --output-depth 10 --output "F:\MKV\Hybrid\QUANTUM_OF_SOLACE-2008-REMUX-003200-003400_new.264" -

Avs preview

LoadPlugin("C:\PROGRA~1\Hybrid\32bit\avisynthPlugins\LSMASHSource.dll")
SetFilterMTMode("DEFAULT_MT_MODE", MT_MULTI_INSTANCE)
# loading source: F:\MKV\QUANTUM_OF_SOLACE\QUANTUM_OF_SOLACE-2008-REMUX-003200-003400.mkv
#  input color sampling YV12
#  input luminance scale tv
LWLibavVideoSource("F:\MKV\QUANTUM_OF_SOLACE\QUANTUM_OF_SOLACE-2008-REMUX-003200-003400.mkv",cache=false,stacked=true,format="YUV420P8",repeat=true)
# current resolution: 1920x1080
# filtering
# adjusting bit depth current 8 to target 8
PreFetch(6)
return last

Do I need any conversion 8 to 10 bits in avs? Or is that enough? I ask, because when I chose x265, Avs has changed to:

LoadPlugin("C:\PROGRA~1\Hybrid\32bit\avisynthPlugins\LSMASHSource.dll")
SetFilterMTMode("DEFAULT_MT_MODE", MT_MULTI_INSTANCE)
# loading source: F:\MKV\QUANTUM_OF_SOLACE\QUANTUM_OF_SOLACE-2008-REMUX-003200-003400.mkv
#  input color sampling YV12
#  input luminance scale tv
LWLibavVideoSource("F:\MKV\QUANTUM_OF_SOLACE\QUANTUM_OF_SOLACE-2008-REMUX-003200-003400.mkv",cache=false,stacked=true,format="YUV420P8",repeat=true)
# current resolution: 1920x1080
# filtering
# adjusting bit depth current 8 to target 10
# avisynthPreview 0, avisynthScriptView 1
# convert to 10bit for encoder
ConvertBits(10)
PreFetch(6)
return last

This has ConvertBits(10). But then I chose x264 again and the AVS was the same, with ConvertBits(10).
I am almost newbie in encoding. I'm a little confused.

Thank you! And i apologize for my bad english.


Screens if they needed.