heif-dec fails to decode avc image created by heif-enc #1866

tony@ares:~/dev/imager/git/imager-file-heif$ LD_LIBRARY_PATH=~/local/libheif-1.23.1/lib/ ~/local/libheif-1.23.1/bin/heif-enc --avc foo.png foo.avc
tony@ares:~/dev/imager/git/imager-file-heif$ LD_LIBRARY_PATH=~/local/libheif-1.23.1/lib/ ~/local/libheif-1.23.1/bin/heif-dec foo.avc out.png
File contains 1 image
Could not decode image: Invalid input: Invalid image size: Decoded image does not have the size signaled in the file.
tony@ares:~/dev/imager/git/imager-file-heif$ file foo.png foo.avc
foo.png: PNG image data, 150 x 150, 8-bit/color RGB, non-interlaced
foo.avc: ISO Media
tony@ares:~/dev/imager/git/imager-file-heif$ LD_LIBRARY_PATH=~/local/libheif-1.23.1/lib/ ~/local/libheif-1.23.1/bin/heif-info foo.avc
MIME type: image/avci
main brand: avci
compatible brands: mif1, avci, miaf

image: 150x150 (id=1), primary
  colorspace: YCbCr, 4:2:0
  bit depth: 8
  color profile: nclx
    colour primaries: 1 (BT.709)
    transfer characteristics: 13 (IEC 61966-2-1 (sRGB))
    matrix coefficients: 6 (BT.601)
    full range flag: 1 (full)
  alpha channel: no 
  depth channel: no
metadata:
  none
transformations:
  crop: left=0 top=0 right=5 bottom=5
region annotations:
  none
text items:
  none
properties:
none
MIME items:
tony@ares:~/dev/imager/git/imager-file-heif$ LD_LIBRARY_PATH=~/local/libheif-1.23.1/lib/ ~/local/libheif-1.23.1/bin/heif-enc --list-encoders
AVC encoders:
- x264 = x264 AVC encoder ( r3108 31e19f9) [default]
AVIF encoders:
- aom = AOMedia Project AV1 Encoder v3.12.1 [default]
- rav1e = Rav1e encoder v0.7.1
HEIC encoders:
- x265 = x265 HEVC encoder (4.1+1-1d117be) [default]
JPEG encoders:
- jpeg = libjpeg-turbo 2.1.5 (libjpeg 6.2) [default]
JPEG 2000 encoders:
JPEG 2000 (HT) encoders:
Uncompressed encoders:
- uncompressed = builtin [default]
VVIC encoders:

tony@ares:~/dev/imager/git/imager-file-heif$ LD_LIBRARY_PATH=~/local/libheif-1.23.1/lib/ ~/local/libheif-1.23.1/bin/heif-dec --list-decoders
AVC decoders:
- openh264 = OpenH264 2.6.0
AVIF decoders:
- dav1d = dav1d v7.0.0
- aom = AOMedia Project AV1 Decoder v3.12.1
HEIC decoders:
- libde265 = libde265 HEVC decoder, version 1.0.15
JPEG decoders:
- jpeg = libjpeg-turbo 2.1.5 (libjpeg 6.2)
JPEG 2000 decoders:
JPEG 2000 (HT) decoders:
uncompressed:
- uncompressed = builtin
VVIC decoders: