h.264 – washed out colors when converting h264 into vp9 using ffmpeg

I’m trying to convert an h264 video to vp9/opus webm.
Every attempt so far has had washed out colors.
Is there a fix for this issue or is it just the way h264->vp9 conversion is?

ffprobe of the source file:

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test1.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2024-07-30T17:03:10.000000Z
    com.android.version: 10
  Duration: 00:01:04.07, start: 0.000000, bitrate: 20198 kb/s
  Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt470bg/bt470bg/smpte170m, progressive), 1920x1080, 20001 kb/s, SAR 1:1 DAR 16:9, 30 fps, 30 tbr, 90k tbn (default)
    Metadata:
      creation_time   : 2024-07-30T17:03:10.000000Z
      handler_name    : VideoHandle
      vendor_id       : [0][0][0][0]
    Side data:
      displaymatrix: rotation of -90.00 degrees
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 96 kb/s (default)
    Metadata:
      creation_time   : 2024-07-30T17:03:10.000000Z
      handler_name    : SoundHandle
      vendor_id       : [0][0][0][0]