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[Selur]

I looked at the debug output, Vapoursynth script seems okay:

And aside that I would recommend moving the temp folder, the encoding call:

"C:\Program Files\Hybrid\64bit\Vapoursynth\vspipe.exe" "C:\Users\User\AppData\Local\Temp\encodingTempSynthSkript_2025-08-27@04_50_42_2854_0.vpy" - --outputindex 0 -c y4m | C:\Program Files\Hybrid\64bit\ffmpeg.exe" -y -noautorotate -nostdin -threads 8 -color_primaries bt470m -color_trc smpte170m -colorspace bt470bg -color_range tv -f yuv4mpegpipe -i - -an -sn -color_primaries bt470m -color_trc smpte170m -colorspace bt470bg -color_range tv -pix_fmt yuv422p10le -strict -1 -fps_mode passthrough -vcodec prores_ks -profile:v 1 -vtag apcs -metadata encoding_tool="Hybrid 2025.07.27.1" -aspect 640:480 -f mov "C:\Users\User\AppData\Local\Temp\5 - Roll For it_5_2025-08-27@04_50_42_2854_03.mov"

looks fine too.
FFMmpeg reports:

ffmpeg version N-120379-g29368ccb48 Copyright (c) 2000-2025 the FFmpeg developers
  built with gcc 15.1.0 (Rev8, Built by MSYS2 project)
  configuration:  --pkg-config=pkgconf --cc='ccache gcc' --cxx='ccache g++' --ld='ccache g++' --extra-cxxflags=-fpermissive --extra-cflags=-Wno-int-conversion --disable-autodetect --enable-amf --enable-bzlib --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --enable-ffnvcodec --enable-nvdec --enable-cuda-llvm --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libdav1d --enable-libaom --disable-debug --enable-fontconfig --enable-libass --enable-libbluray --enable-libfreetype --enable-libharfbuzz --enable-libmfx --enable-libmysofa --enable-libopenjpeg --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libwebp --enable-libxml2 --enable-libzimg --enable-libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libopenmpt --enable-librav1e --enable-libsrt --enable-libgsm --enable-libvmaf --enable-libsvtav1 --enable-libglslang --enable-vulkan --enable-liboapv --extra-cflags=-DLIBTWOLAME_STATIC --extra-cflags=-DLIBXML_STATIC --extra-libs=-liconv --disable-w32threads
  libavutil      60.  6.100 / 60.  6.100
  libavcodec     62.  8.100 / 62.  8.100
  libavformat    62.  1.103 / 62.  1.103
  libavdevice    62.  0.100 / 62.  0.100
  libavfilter    11.  3.100 / 11.  3.100
  libswscale      9.  0.100 /  9.  0.100
  libswresample   6.  0.100 /  6.  0.100

Input #0, yuv4mpegpipe, from 'fd:':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: rawvideo (Y3[10][10] / 0xA0A3359), yuv422p10le(progressive), 640x480, 23.98 fps, 23.98 tbr, 23.98 tbn

Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> prores (prores_ks))

[vf#0:0 @ 000000000297c2c0] No filtered frames for output stream, trying to initialize anyway.

Output #0, mov, to 'C:\Users\User\AppData\Local\Temp\5 - Roll For it_5_2025-08-27@04_50_42_2854_03.mov':
  Metadata:
    encoding_tool   : Hybrid 2025.07.27.1
    encoder         : Lavf62.1.103
  Stream #0:0: Video: prores (LT) (apcs / 0x73637061), yuv422p10le(progressive), 640x480 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 23.98 fps, 24k tbn
    Metadata:
      encoder         : Lavc62.8.100 prores_ks

2025.08.27 - 04:51:29_Windows 11 Version 24H2 (64bit)_2025.07.27.1 - level 9: FFmpeg output: [out#0/mov @ 0000000002972e40] video:0KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
[out#0/mov @ 0000000002972e40] Output file is empty, nothing was encoded(check -ss / -t / -frames parameters if used)
frame=    0 fps=0.0 q=0.0 Lsize=       0KiB time=N/A bitrate=N/A speed=N/A elapsed=0:00:00.00

and stops without an error.
=> Did you try what I suggested? Does the Vapoursynth Preview work?

Cu Selur