Incorrect gif generation on ppc64le

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Using palettes to create gifs produces output with single-pixel vertical columns between transparent space. (Creating gifs with the more rudimentary "ffmpeg -i file.mp4 -ss 1 -t 4 -r 480:272 output.gif -hide_banner" does work, however.)

To recreate on a ppc64le environment:

ffmpeg -v warning -ss 1 -t 4 -i file.mp4 -vf "fps=15,scale=480:-1:flags=lanczos,palettegen" -y "/path/to/temporary_palette"

ffmpeg -v warning -ss 1 -t 4 -i file.mp4 -i /path/to/temporary_palette -lavfi "fps=15,scale=480:-1:flags=lanczos [x]; [x][1:v] paletteuse" -y output.gif

The output creates a gif with thin columns which appear to have some color and animation data.

Sample files are attached.

[Underpaid]

The output, using the palette generation method

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Source video

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ffmpeg -v -buildconf

ffmpeg version 4.1.6-1~deb10u1 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
  configuration: --prefix=/usr --extra-version='1~deb10u1' --toolchain=hardened --libdir=/usr/lib/powerpc64le-linux-gnu --incdir=/usr/include/powerpc64le-linux-gnu --arch=ppc64el --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  WARNING: library configuration mismatch
  avcodec     configuration: --prefix=/usr --extra-version='1~deb10u1' --toolchain=hardened --libdir=/usr/lib/powerpc64le-linux-gnu --incdir=/usr/include/powerpc64le-linux-gnu --arch=ppc64el --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-liblensfun --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
  avfilter    configuration: --prefix=/usr --extra-version='1~deb10u1' --toolchain=hardened --libdir=/usr/lib/powerpc64le-linux-gnu --incdir=/usr/include/powerpc64le-linux-gnu --arch=ppc64el --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared --enable-version3 --disable-doc --disable-programs --enable-liblensfun --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
  libavutil      56. 22.100 / 56. 22.100
  libavcodec     58. 35.100 / 58. 35.100
  libavformat    58. 20.100 / 58. 20.100
  libavdevice    58.  5.100 / 58.  5.100
  libavfilter     7. 40.101 /  7. 40.101
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100

  configuration:
    --prefix=/usr
    --extra-version='1
    deb10u1'
    --toolchain=hardened
    --libdir=/usr/lib/powerpc64le-linux-gnu
    --incdir=/usr/include/powerpc64le-linux-gnu
    --arch=ppc64el
    --enable-gpl
    --disable-stripping
    --enable-avresample
    --disable-filter=resample
    --enable-avisynth
    --enable-gnutls
    --enable-ladspa
    --enable-libaom
    --enable-libass
    --enable-libbluray
    --enable-libbs2b
    --enable-libcaca
    --enable-libcdio
    --enable-libcodec2
    --enable-libflite
    --enable-libfontconfig
    --enable-libfreetype
    --enable-libfribidi
    --enable-libgme
    --enable-libgsm
    --enable-libjack
    --enable-libmp3lame
    --enable-libmysofa
    --enable-libopenjpeg
    --enable-libopenmpt
    --enable-libopus
    --enable-libpulse
    --enable-librsvg
    --enable-librubberband
    --enable-libshine
    --enable-libsnappy
    --enable-libsoxr
    --enable-libspeex
    --enable-libssh
    --enable-libtheora
    --enable-libtwolame
    --enable-libvidstab
    --enable-libvorbis
    --enable-libvpx
    --enable-libwavpack
    --enable-libwebp
    --enable-libx265
    --enable-libxml2
    --enable-libxvid
    --enable-libzmq
    --enable-libzvbi
    --enable-lv2
    --enable-omx
    --enable-openal
    --enable-opengl
    --enable-sdl2
    --enable-libdc1394
    --enable-libdrm
    --enable-libiec61883
    --enable-chromaprint
    --enable-frei0r
    --enable-libx264
    --enable-shared

[Carl Eugen Hoyos]

For future tickets: Please test current FFmpeg git head, the only version supported on this bug tracker, and always provide the actual command line you tested together with the complete, uncut console output.
Fixed in 2687070d9b092d3a354a6963c65197054ddf7a75, see ticket #9077.